Release Notes

Version 0.23.9

Release date: 2014-12-28

Packages:   klayout-0.23.9.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.23.9-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.23.9-win64-install.exe (WIN64 installer)
klayout_0.23.9-1_i386.deb (Package for Debian/Ubuntu 12.04, 32bit)
klayout_0.23.9-1_amd64.deb (Package for Debian/Ubuntu 12.04, 64bit)


  • Bugfix: DEF reader: E and W pin orientation was swapped.
  • Bugfix: DEF reader: PIN definitions are read correctly even if the PLACED statement comes before the LAYER statement.
  • Enhancement: LEF reader: deprecated keyword TOPOPSTACKONLY is ignored for VIA statements now instead of giving an error.
  • Enhancement: DEF reader: the reader now is able to read BLOCKAGE definitions. Currently, routing and placement blockages are supported. The layers they appear on can be configured the in the same fashion than for the other elements.
  • Bugfix: Typing in the Macro Editor was slow if many macros were bound to menus.
  • Enhancement: GDS AREF's with pitches not a multiple of the database unit are split into individual arrays rather than simply rounding the pitch. The disadvantage of the rounding solution was an accumulation of rounding errors over the array instances leading to a substantial deviation from the target location.
  • Bugfix: Paths have sometimes not been displayed properly, specifically paths with a small segment length and sharp bends.
  • Bugfix: DXF reader: bulges have not been ignored on the last vertex of a non-closed POLYLINE as they should.

Version 0.23.8

Release date: 2014-10-11

Packages:   klayout-0.23.8.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.23.8-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.23.8-win64-install.exe (WIN64 installer)
klayout_0.23.8-1_i386.deb (Package for Debian/Ubuntu 12.04, 32bit)
klayout_0.23.8-1_amd64.deb (Package for Debian/Ubuntu 12.04, 64bit)


  • Bugfix: DRC: "inside", "not_inside", "outside" and "not_outside" were broken
  • Bugfix: LEF/DEF reader: VIA PATTERN support was broken
  • Enhancement: LEF/DEF reader: Support for LEF/DEF Version 5.8 syntax
  • Bugfix: The Tab order of certain dialogs was weired
  • Bugfix: Multi-layout layer properties files in technology setups behaved strangely. Now, the behavior of layout properties files (.lyp) is the same in the technology context and the usual application context.

Version 0.23.7

Release date: 2014-10-11

Packages:   klayout-0.23.7.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.23.7-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.23.7-win64-install.exe (WIN64 installer)
klayout_0.23.7-1_i386.deb (Package for Debian/Ubuntu 12.04, 32bit)
klayout_0.23.7-1_amd64.deb (Package for Debian/Ubuntu 12.04, 64bit)


  • Bugfix: DRC was crashing on second run if it was overwriting an input file.
  • Bugfix: RBA::InputDialog::ask_double was not accepting negative numbers.
  • Bugfix: With a net highlighted in the net tracer, so view zoomed to show the whole net if a layer was shown or hidden.
  • Bugfix: Ruler snapping was disabled for moderately complex hierarchies. The threshold has been increased. Now snapping of the ruler to objects also works for denser and more complex layouts.
  • Bugfix: Some signals were not available to Ruby (i.e. QIODevice signals).
  • Enhancement: When using "Hide empty layers", the layer list will scroll to keep the selected layer visible (unless it is empty and hidden therefore).
  • Enhancement: A "split view" for the cell trees. When multiple layouts are loaded in a panel, you can choose split view (right mouse in cell list, check "Split View"). In split view, up to 5 cell trees are shown at the same time.

Version 0.23.6

Release date: 2014-08-20

Packages:   klayout-0.23.6.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.23.6-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.23.6-win64-install.exe (WIN64 installer)
klayout_0.23.6-1_i386.deb (Package for Debian/Ubuntu 12.04, 32bit)
klayout_0.23.6-1_amd64.deb (Package for Debian/Ubuntu 12.04, 64bit)


  • Bugfix: A DRC issue was fixed. Sometimes errors were reported too many times. This happened for big polygons wrapping smaller ones.
  • Enhancement: Now, macro key bindings can be edited on the key binding page of the setup dialog too if the macros are shown in the menu. Before, those changes were reset when the program was closed.
  • Enhancement: The DXF reader now also considers thin (width = 0) POLYLINES as mergable edge contributions in the "merge edge" modes if the POLYLINES are closed ones too.
  • Bugfix: The float function in the OASIS writer was fixed. This is a code cleanup, and did not have effect on functionality (yet).

Version 0.23.5

Release date: 2014-07-04

Packages:   klayout-0.23.5.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.23.5-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.23.5-win64-install.exe (WIN64 installer)
klayout_0.23.5-1_i386.deb (Package for Debian/Ubuntu 12.04, 32bit)
klayout_0.23.5-1_amd64.deb (Package for Debian/Ubuntu 12.04, 64bit)


  • Bugfix: DXF polyline mode could not be set in reader options in Ruby. A value of 3 and 4 was not allowed.
  • Enhancement: CIRCLE AND ELLIPSE objects are treated as thin lines in DXF reader's "merge edges" mode. Hence they participate in region formation.
  • Enhancement: A warning is displayed when an ambiguous keyboard shortcut is triggered
  • Bugfix: An assertion in the boolean processor was fixed.
  • Bugfix: The following command caused the program to crash on the Ruby console: "require 'net/http'; uri = URI('xyz')" .
  • Bugfix: The "cell" function in DRC scripts was creating a new cell if is was not existing yet. In general, the DRC function is not supposed to change the layout's hierarchy.
  • Bugfix: The macro editor now can distinguish between the same file with different suffixes. Before, "test.rb" and "test.lym" were not presented as different files.
  • Enhancement: The marker browser now indicates if the number of markers exceeds the specified maximum and the list is shortened.
  • Bugfix: The "browser.rb" sample was not working any longer because of a backward compatibility issue.

Version 0.23.4

Release date: 2014-03-16

Packages:   klayout-0.23.4.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.23.4-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.23.4-win64-install.exe (WIN64 installer)
klayout_0.23.4-1_i386.deb (Package for Debian/Ubuntu 12.04, 32bit)
klayout_0.23.4-1_amd64.deb (Package for Debian/Ubuntu 12.04, 64bit)


  • Bugfix: UTF8 encoding in XML was ignored - special characters have not been read properly. This in particular caused issues in the .lym macro files when UTF8 characters are employed.
  • Bugfix: Backward compatiblity issue: layout files with PCells written with 0.23 could not be read with 0.22 and vice versa.
  • Bugfix: Label text centering and right-alignment was not working propertly with the default font.
  • Bugfix: A segmentation fault occuring when rerunning a PCell macro has been fixed.
  • Bugfix: PCell layer parameters can be set to "no layer" now. This was possible before, but caused some issues - i.e. creation of dead layers.

Version 0.23.3

Release date: 2014-02-22

Packages:   klayout-0.23.3.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.23.3-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.23.3-win64-install.exe (WIN64 installer)
klayout_0.23.3-1_i386.deb (Package for Debian/Ubuntu 12.04, 32bit)
klayout_0.23.3-1_amd64.deb (Package for Debian/Ubuntu 12.04, 64bit)
CentOS 6.x download link
Fedora 20.x und SUSE (SLES und openSUSE) download link


  • Bugfix: DRC bug fixed: "@x" notation was not working for layout, source and target.
  • Bugfix: A boolean processor bug was fixed that caused an internal error in some rare cases with certain edge configurations.
  • Bugfix: Image documentation was wrong about the offset meaning: it's the center, not the lower left corner.
  • Bugfix: Layer table tab names were lost when sorting or regrouping a layer list.
  • Enhancement: The net tracer now can be configured to auto-color the nets with a set of predefined colors. 8 colors can be configured in the configuration dialog or the net tracer setup page in the setup dialog.
  • Enhancement: The net tracer now has a "Redo" button which will trace all nets in the list again using the original start and stop (for path tracing) locations.

Version 0.23.2

Release date: 2014-01-26

Packages:   klayout-0.23.3.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.23.3-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.23.3-win64-install.exe (WIN64 installer)
klayout_0.23.3-1_i386.deb (Package for Debian/Ubuntu 12.04, 32bit)
klayout_0.23.3-1_amd64.deb (Package for Debian/Ubuntu 12.04, 64bit)
klayout-0.23.2.pkg (MacOS 10.9, binary package)


  • Bugfix: Build issues fixed for MacOS and some Qt versions.
  • Bugfix: DRC log to file was not working.
  • Bugfix: Ruby script was crashing when using ruby-implemented tiling processor receiver and multi-threaded tiling.
  • Bugfix: Layout move function was using database units instead of micron.
  • Bugfix: Search & replace markes where not shown in a reasonable context for search in "All cells", instance markers are not shown correctly.
  • Bugfix: DRC now also handles the case of different database units for multiple inputs. The database unit of output files is now taken from the input.
  • Enhancement: Search & replace layer selection combo boxes now show display string
  • Enhancement: Unexpected elements are ignored in XML files.
  • Enhancement: Options are provided for making boolean operations not optimize the "single empty input" case for XOR tool and DRC (strict handling mode).

Version 0.23.1

Release date: 2013-12-07

Packages:   klayout-0.23.1.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.23.1-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.23.1-win64-install.exe (WIN64 installer)
klayout_0.23.1-1_i386.deb (Package for Debian/Ubuntu 12.04, 32bit)
klayout_0.23.1-1_amd64.deb (Package for Debian/Ubuntu 12.04, 64bit)


  • Bugfix: RBA SimplePolygon#inside? and Polygon#inside? now work as expected
  • Bugfix: DRC output to marker browser now works as expected
  • Bugfix: HTTP URL's now are written as such into the MRU list
  • Bugfix: A net tracer crash was fixed
  • Bugfix: Net tracer connectivity setup: the move buttons now work as expected
  • Bugfix: a DRC issue was fixed when assigning the output of modifying operations (i.e. "layer=layer.move(...)" was causing a crash).
  • Bugfix: some memory and static code analysis issues have been fixed after analysis with valgrind, clang and Coverity
  • Enhancement: compatibility with clang 3.3 was established as well as compatibility with Ruby 2.0

Version 0.23

Release date: 2013-11-26

Packages:   klayout-0.23.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.23-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.23-win64-install.exe (WIN64 installer)
klayout_0.23-1_i386.deb (Package for Debian/Ubuntu 12.04, 32bit)
klayout_0.23-1_amd64.deb (Package for Debian/Ubuntu 12.04, 64bit)


  • Enhancement: Net tracer: Nets can now be colored individually. By default the coloring is taken from the configuration, but it is possible to assign a specific color to a net later. Click on the net and choose a color in the net info section right to the list of nets.
  • Enhancement: The OASIS writer now uses CBLOCK compression also for tables.
  • Enhancement: Transparency is now supported for images (as a mask only - not a real alpha channel, but close to).
  • Enhancement: The layer/datatype assignment for purely named layers originating from DXF or CIF has changed. It's now no longer done when reading DXF or CIF but when writing the file. This solution is more general and allows some level of control, i.e. by scripts.
  • Enhancement: "http:..." URLs are now allowed as file names - such files are loaded from the URL instead. Such URL's can be used from the command line or within scripts for example. Drag and drop of HTTP URLs is also support. This allows dropping of URLs from the browser into KLayout.
  • Enhancement: Menus have been rearranged: The "Tools" menu was split into "Tools" and "Macros", "Verification" menu has been resolved into the "Tools" menu. The "Tools" menu now is lighter and ready to accommodate more entries in the future.
  • Enhancement: New command line options are available: "-nn" to load .lyt (technology file) on command line. "-b" for batch mode (implies some batch-mode specific options), "-zz" for display-less applications.
  • Enhancement: "Adjust cell origin" now adjusts the cell in their parents as well (optional).
  • Enhancement: Cells can have properties now: Cells can now have user properties as well. However, writing these properties to files is subject to some constraints. Cell properties are fully supported on OASIS and optionally supported on GDS using an extension feature. By default, cell properties are not written to GDS.
  • Enhancement: Transformations are now available for whole layout (applied to all cells). This is specifically useful for scaling layouts. These functions are available in Edit/Layout.
  • Enhancement: A function now is available to convert PCell's to normal (static) cells. This function can be found in Edit/Layout (for all cells) and Edit/Cell (for the selected cells).
  • Enhancement: The printout now has a header and footer.
  • Enhancement: The XOR can now be confined to a region. By default, the scope is "All". Alternatively, the visible region or a region marked by one or more rulers can be considered for the compare.
  • Enhancement: There is an option now to hide guiding shapes for PCell instances. This option can be found on "Display/Cell" in the setup dialog. Other options allow to configure the way the guiding shapes are shown.
  • Enhancement: New option to pan/zoom or do nothing on paste - Option is in "Navigation/Zoom and Pan" in setup dialog.
  • Enhancement: Cells can now be copied in "shallow copy" mode without creating copies of the child cells. If "copy cells" is chosen on a cell which has child cells, shallow or deep copy mode can be selected.
  • Enhancement: A "Tap" function is provided now. The tap function selects and changes to the layer of the currently selected shape. New shapes will be put on that layer.
  • Enhancement: There now is a function to convert instance arrays to single instances. The function is called "Resolve arrays" and is available in Edit/Selection.
  • Enhancement: The instantiation path of an object is now shown in the status bar.
  • Enhancement: An option is now provided for configuring the replacement character for OASIS and GDS. The replacement character is used instead of illegal characters.
  • Enhancement: Some unicode support for texts in default font ("ยต" now is available).
  • Enhancement: There is a GDS2 writer option now to eliminate zero-length paths.
  • Enhancement: There are new save options: disable or enable writing of PCell and library cell contexts, drop hidden cells (allows to select certain levels of hierarchy by choosing only those levels for display), keep instances even if cells are dropped (creates ghost cells).
  • Enhancement: Layers can now be made invalid. Invalid layers don't participate in selection or snapping. To make selected layers invalid, choose "Make invalid" from the layer context menu, to make them valid again, choose "Make valid".
  • Enhancement: Multi-selection on 'open layout' allows to open many files at once.
  • Enhancement: DRC functionality: a rich DRC engine was integrated in the tool. The implementation is flat, so performance is limited compared to hierarchical tools. A tiling approach is available to distribute tasks on multiple CPU's to somewhat mitigate that issue. Detailed information about that feature can be found here.
  • Enhancement: Search and replace feature plus custom queries: the search & replace functionality is just the tip of the iceberg. "Custom queries" are a powerful feature to perform queries and modifications using a SQL-like language. Details about this feature can be found here
  • Enhancement: Some enhancements on LEF/DEF import: i.e. proper default routing rule with octagon ends implemented in DEF, NONDEFAULTRULES for LEF reader
  • Enhancement: Auto-import feature for technologies: technologies can now be imported from the installation folder automatically.
  • Enhancement: RBA enhancements: Tiling processor, fill tool bindings, regions, edge collections, edge pairs and edge pair collections, numerous new methods and classes.
  • Enhancement: More configuration options for macro IDE: stop on exception will ask whether to stop in the debugger when an exception is thrown. The editor font can now be configured.
  • Enhancement: The diff tool now has an option to disable smart cell matching and enable name-only cell matching.
  • Enhancement: cells can now be dragged and dropped from the cell list to the canvas.
  • Bugfix: Layout diff reported texts as different which are not.
  • Bugfix: Instance editor options problem fixed: magnification could not be edited in some cases.
  • Bugfix: DXF reader: anisotropic scaling of block deletes subcells of that block, error messages on coordinate overflow.
  • Bugfix: OASIS output files were corrupt when edge objects were written.
  • Bugfix: Problems with boxes having odd width are solved now.
  • Bugfix: Close function - "Cancel" now works properly on the "which view to close" dialog.
  • Bugfix: Closing the main window while layouts are loaded crashed the application.
  • Bugfix: Net tracer did not work properly with OASIS in viewer mode.
  • Bugfix: Diff tool was not matching cells propertly in some cases

Version 0.22.9

Release date: 2013-09-22

Packages:   klayout-0.22.9.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.22.9-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.22.9-win64-install.exe (WIN64 installer)
klayout_0.22.9-1_i386.deb (Package for Debian/Ubuntu 12.04, 32bit)
klayout_0.22.9-1_amd64.deb (Package for Debian/Ubuntu 12.04, 64bit)


  • Bugfixes: LEF/DEF reader: NONDEFAULTRULES, TAPERRULE implemented now, correct octagon style for default rules for non-rectangular routing, POLYGON and RECT implemented for routing.
  • Bugfix: DXF reader crash fixed for ARC objects with identical start and end angle, polygons have not been read in some cases.
  • Bugfix: It is possible again to use "Show as new top" after "Descend/Ascend hierarchy" without clicking at the cell list.

Version 0.22.8

Release date: 2013-06-21

Packages:   klayout-0.22.8.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.22.8-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.22.8-win64-install.exe (WIN64 installer)
klayout_0.22.8-1_i386.deb (Package for Debian/Ubuntu 12.04, 32bit)
klayout_0.22.8-1_amd64.deb (Package for Debian/Ubuntu 12.04, 64bit)


  • Enhancement: "gds2" now is recognized as extension of GDS files.
  • Bugfix: CIF reader was broken in some cases. Layers have not been assigned properly and sometimes, identical or no GDS layers were assigned.
  • Bugfix: RecursiveShapeIterator (RBA) had an issue when iterating shape arrays. This was the case when working on OASIS files in viewer mode for example.
  • Bugfix: DEF reader had some issues (TAPER and RESISTANCE keywords have not been supported properly).

Version 0.22.7

Release date: 2013-03-05

Packages:   klayout-0.22.7.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.22.7-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.22.7-win64-install.exe (WIN64 installer)
klayout_0.22.7-1_i386.deb (Package for Debian/Ubuntu 12.04, 32bit)
klayout_0.22.7-1_amd64.deb (Package for Debian/Ubuntu 12.04, 64bit)


  • Bugfix: The output mode in the XOR tool dialog was not shown properly. Instead of "Report database", "Other layout" was shown etc.
  • Bugfix: When creating a third layout for output of the XOR tool, the database unit was not set to the input layout's database unit.
  • Bugfix: Layout numbering was not done correctly when multiple layouts were loaded with the same file name.
  • Bugfix: In viewer mode sometimes it was not possible to move to the next selected item in the shape properties dialog. A message appeared saying "Shape array members cannot be modified."
  • Enhancement: OASIS writer performance is significantly better now in cases where shape compression is relevant. Also, shape arrays are maintained as such which avoids repeated compression.
  • Bugfix: A drawing bug was fixed which caused shape arrays to disappear on certain zoom levels.
  • Bugfix: "Add missing layers" now adds all existing layers, not just the ones present in the currently selected cell also in viewer mode.

Version 0.22.6

Release date: 2013-03-05

Packages:   klayout-0.22.6.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.22.6-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.22.6-win64-install.exe (WIN64 installer)
klayout_0.22.6-1_i386.deb (Package for Debian/Ubuntu 12.04, 32bit)
klayout_0.22.6-1_amd64.deb (Package for Debian/Ubuntu 12.04, 64bit)
klayout-0.22.6.pkg (MacOS, installer)


  • Bugfix: It was possible for example to add shapes to a PCell. This feature does not make sense since PCell's are updated when required. In that case, changes are lost. This feature has been disabled for PCell's.
  • Bugfix: RBA::Application#get_config was crashing in some cases (i.e. in -zz mode)
  • Bugfix: The "create cell variants" function was not working properly if a single instance array was present for a cell.
  • Bugfix: The radius was limited too strictly for end segments for the ROUND_PATH PCell of the Basic library.
  • Enhancement: Some additional RBA methods have been enabled which disambiguate various constructors for Qt objects (i.e RBA::QVariant#new_i allows to create a variant with "int" type)
  • Bugfix: the Ruby-less build was broken.
  • Bugfix: Copy & paste was not working for the layer list. This is an effect of the modified key handling in KLayout 0.22. New menu functions are provided in the layer list's context menu to resolve the ambiguities involved in that feature. These menu functions allow to copy, cut and paste parts of the layer list to other windows or tabs.
  • Bugfix: PCell's are now cleared before the production method is called.
  • Enhancement: OASIS layer names are also recognized if the LAYERNAME record appears after the layout's body.
  • Bugfix: in previous versions it could happen that the layout panels got locked and it was no longer possible to switch between different tabs.
  • Bugfix: a potential crash in the drawing engine was fixed.

Version 0.22.5

Release date: 2013-02-03

Packages:   klayout-0.22.5.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.22.5-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.22.5-win64-install.exe (WIN64 installer)
klayout_0.22.5-1_i386.deb (Package for Debian/Ubuntu 12.04, 32bit)
klayout_0.22.5-1_amd64.deb (Package for Debian/Ubuntu 12.04, 64bit)


  • Bugfix: Layer properties file in technology definitions can be given as relative path in which case KLayout uses the base path now.
  • Enhancement: Windows installer now provides a useful default installation path when started as non-administrator.
  • Bugfix: GDS reader: a false warning was issued sometimes indicating that an AREF might be off-grid.
  • Bugfix: Fixed build for MacOS and some Linux distributions.
  • Bugfix: Fixed a crash that happened when KLayout was closed while a instance property form was still open.
  • Enhancement: PCell names are now shown in the status bar
  • Bugfix: Fixed a crash that happened when a macro was run that was already closed.
  • Bugfix: MRU list for macro editor's console was getting huge when the macro editor was closed and opened again in the same session.
  • RBA bugfixes: "destroyed?" was not working properly in some cases. Infinite recursion happened for for PCell implementation without "get_layers".
  • Enhancement: Better error messages for RBA including class and method names.
  • Bugfix: PCell implementation issue. Some methods were passed a deep copy of the layout object which first created a potential performance issue and second made it impossible to modify the layout.
  • Enhancement: DXF writer now provides a header which enables some tools to read the generated DXF files.
  • Bugfix: DXF reader: degenerated polygons for HATCH objects don't cause an assertion now.

Version 0.22.4

Release date: 2012-12-30

Packages:   klayout-0.22.4.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.22.4-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.22.4-win64-install.exe (WIN64 installer)
klayout_0.22.4-1_i386.deb (Package for Debian/Ubuntu 12.04, 32bit)
klayout_0.22.4-1_amd64.deb (Package for Debian/Ubuntu 12.04, 64bit)


  • The bugs mentioned for 0.22.3 on the Issues and known bugs page are fixed.
  • Enhancement: the "detailed" view of a net's properties in the net tracer now reports area and perimeter of the net's shapes (only available for nets up to ~2000 shapes to avoid timeouts on computation). Thanks to Peter for providing the raw version of that code.
  • DXF reader enhancements: Support for "999" comment records. DIMENSION and SPLINE entities are supported now to some extent. "fit" formatting of TEXT objects supported now. Holes are correctly formed now from multiple POLYLINE/LINE items when combining them into polygons.
  • DXF writer: HATCH entries are written in a compatible way now. Text formatting flags are fixed (top and bottom formatting was swapped).

Version 0.22.3

Release date: 2012-11-25

Packages:   klayout-0.22.3.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.22.3-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.22.3-win64-install.exe (WIN64 installer)
klayout_0.22.3-1_i386.deb (Package for Debian/Ubuntu 12.04, 32bit)
klayout_0.22.3-1_amd64.deb (Package for Debian/Ubuntu 12.04, 64bit)


  • The bugs mentioned on the Issues and known bugs page are fixed.
  • Bugfix: a segmentation fault sometimes happened in the drawing engine
  • DXF reader enhancements: Anisotropic scaling of instances is supported. LWPOLYLINES with both common and variable width are handled more gracefully. Closed polylines produce closed shapes now, not closed paths.
  • Selecting of instances with non-orthogonal transformations is easier now
  • The local config files now override the global one again like this was in 0.21.x.
  • A compile problem with older gcc's (namely gcc 4.4) was fixed.
  • Selection of cells in the cell tree now has been fixed (before that sometimes cells were selected in addition to current ones instead of being the only one selected).
  • The RVE DB reader was enhanced to read error waivers and certain new forms of the RVE file.
  • The align operation now works also if there is not a primary and secondary selection (i.e. selection by box)
  • "Layer pollution" does not happen when instantiating a PCell or library cell which is instantiated in another panel
  • PCell layer parameters now can be set to any layer which is present in the layer list, not just the ones which are created already in the database
  • The round corners function has been fixed for certain cases. In particular the limitations are less strict (for example it is possible now to create a donut from a square with a hole). Changing of the radius later now works more reliably.
  • "Shallow copy mode" now works again for copy & paste of instances. Previously instances were always copies in deep copy mode which creates new cells.
  • Move of partial selection now works like the move function for other objects: select a subset of edges, click on them to start dragging and click again to drop them.
  • Arrow keys don't interfere with move by mouse mode any longer. Previously using the arrow keys while moving objects with the mouse had strange effects.

Version 0.22.2

Release date: 2012-11-01

Packages:   klayout-0.22.2.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.22.2-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.22.2-win64-install.exe (WIN64 installer)
klayout_0.22.2-1_i386.deb (Package for Debian/Ubuntu 12.04, 32bit)
klayout_0.22.2-1_amd64.deb (Package for Debian/Ubuntu 12.04, 64bit)


  • The bugs mentioned on the Issues and known bugs page are fixed.
  • Copy & and paste of PCell or library instances across layouts did not work: Instead, the cell was duplicated, but it's no longer a PCell or library cell.
  • "klayout -v" was crashing: The -v option is supposed to print the version number. After printing it, the executable terminated with a segmentation fault.
  • 'Real' unicode file names could not be used: Using Unicode filenames (i.e. Chinese) file names did not work properly. In particular these files were not opened on Windows. Unicode file names were not recorded properly in the "recently used" list. In version 0.22.2, unicode files names can be used in all places on Windows and Linux.
  • Some LEF import issues solved: The outline layer was not always generated correctly. Pin labels were not generated on pin shapes for LEF import.
  • KLayout was crashing on exit when the clipboard contained something: The application issued a segmentation fault on exit (or "is not working" on Windows) when the clipboard contained data.
  • Ruby debugger crashed in some cases: In some cases (i.e. breakpoint in a widget callback) the debugger crashed with a "Stack level too deep" message.
  • Instances of leaf cells were always copied "flat" to another layout: There was no way to copy the instance plus cells before this was fixed.
  • Sometimes PCell variants remain as top level cells: If the Instance function was cancelled and a PCell was active, a new top cell remained which held the PCell that was about to be placed. These cells could be deleted manually, but that may be annoying.
  • Help index cache was growing large in some cases: When switching between versions, the help index that KLayout creates once grew larger every time a new program version was used. This increased startup times of the program.
  • An "abs" function was missing in expressions.
  • Experimental support for 64bit coordinates is provided. To enable 64bit coordinates, use "-with-64bit-coord" on the build script. This feature requires gcc >= 4.4 and a 64bit platform. 64bit coordinate support is "experimental" because of some known issues (i.e. it is possible to write corrupt GDS files with such large coordinates). OASIS on the other hand supports 64bit coordinates.

Version 0.22.1

Release date: 2012-10-09

Packages:   klayout-0.22.1.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.22.1-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.22.1-win64-install.exe (WIN64 installer)


Version 0.22

Release date: 2012-09-19

Packages:   klayout-0.22.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.22-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.22-win64-install.exe (WIN64 installer)


  • A script (macro) development environment is now integrated into KLayout. It features a simple debugger, a syntax highlighting editor. For details see About Macro Development.
  • KLayout now features an integrated help system (available through the "Help/Assistant" menu entry).
  • Support for libraries. See About Libraries for details.
  • KLayout now supports parametrized cells (PCells). There is a cool feature called "guiding shapes". Learn more about that here: About PCell's.
  • A basic library is provided adding text generation for example to KLayout. See About The Basic Library for details.
  • The net tracer now allows to use layer combinations (derived by boolean operations) for the conductive and via layers. See The Net Tracing Feature for details.
  • A technology management is integrated into Klayout. That allows to switch various settings depending on the choosen technology. See About Technology Management for details about this feature.
  • The drawing can now be rotated or flipped without having to modify the layout. This function can be found in the "Display" menu under "Global Transformation".
  • The "background" combination mode allows to erase parts of existing shapes or add new parts to existing shapes. The background combination mode is available as a new drop-down button in the toolbar.
  • A "cell variant" generation function simplifies hiearchical editing. See Create Cell Variants for details about this feature.
  • General performance improvement of the render. This has been achieved by bitmap caching of cells and various optimisation measures.
  • Images now can be aligned with a layout using landmark points. The possible image transformations now include shear and perspective distortions. See Using Landmarks To Align Images

  • Images can now be stacked and moved to the bottom and to the top.
  • The configuration now is stored along with additional configuration data (i.e. libraries) in a per-user directory in "~/.klayout" on Linux and in the application data path on Windows. The configuration file now is found there and is called "klayoutrc". New locations can be added using $KLAYOUT_PATH.
  • The database unit of the layout can be changed now in the layout properties page (menu: "File/Layout Properties").
  • Most numeric input boxes now accept formulas, i.e. "1254+3221" instead of a single value.
  • By clicking a on single point multiple times you can now cycle the selection through all objects below the point.
  • Layers can be copied (menu: "Edit/Layer/Copy Layer").
  • The selection can be duplicated (menu: "Edit/Duplicate" or Ctrl+B).
  • The size of the default font can now be adjusted (choose between small (current), medium and large on the Display/General page of the setup dialog).
  • The number of points used for circle interpolation can now be adjusted on the Application/Circles page of the setup dialog.
  • Some changes to make the user interface more consistent, i.e. "Synchonized views" has been moved to "Display" where most users where expecting it to be.
  • The selection now can be moved with the cursor keys in move mode.
  • The cell selection dialog allows to specify glob pattern wildcards in the filter box now.
  • OASIS CBLOCK compression and strict mode writing is supported now.
  • Multiple cells now can be selected in the cell tree. Some functions operate on that set (i.e. delete, copy, hide).
  • KLayout now has a LEF/Def import feature. See About LEF/DEF Import for details. This feature is somewhat experimental. Feedback is welcome about that feature.
  • Minor enhancements and bug fixes too numerous to mention here. Just try it out. Maybe your favorite bug is gone now ...

Version 0.21.19

Release date: 2012-06-19

Packages:   klayout-0.21.19.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21.19-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21.19-win64-install.exe (WIN64 installer) (MacOS 10.7)


  • Gerber file reader enhancements: Negative contrast layers supported now with an option to provide a background and 'real' inversion.
  • Gerber reader bugfix: SR command implemented correctly now also for negative contrast.
  • Enhancement: transient selection markers are drawn over other markers for better visibility.
  • Bugfix: XOR tool can be canceled without crash.
  • Fixed build problems with gcc 4.7.0.
  • Fixed a layout import bug (cells have been deleted which should have been kept).
  • OASIS writer bugfixes: don't accumulate rounding errors when writing type 0 or type 1 pointlists. Avoid writing invalid type 0 and 1 pointlists in certain cases.

Version 0.21.18

Release date: 2012-05-14

Packages:   klayout-0.21.18.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21.18-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21.18-win64-install.exe (WIN64 installer)


  • Gerber file reader enhancements: SR (step-and-repeat) is supported now.
  • Gerber reader bugfix: AM macro expansion was not done correctly sometimes.
  • Gerber reader enhancements: removed some superfluous warnings.
  • CIF writer: convert OASIS circles correctly to "R" round flash primitives.
  • Bugfix: copy & paste of layers in the layers tree now works and the copied layers are pasted to the current position.

Version 0.21.17

Release date: 2012-04-12

Packages:   klayout-0.21.17.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21.17-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21.17-win64-install.exe (WIN64 installer)


  • The memory footprint of 8-bit images has been reduced significantly.
  • The "Save current cell as" bug (see here) has been fixed: this function now works as expected.

Version 0.21.16

Release date: 2012-03-05

Packages:   klayout-0.21.16.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21.16-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21.16-win64-install.exe (WIN64 installer)


  • GDS format readers and writers now support time stamps: by default, the current time is written to the files. This option can be turned off in the "Save Layout Options" to simplify comparison of binary files for example. In addition, the timestamp of the BGNLIB record is read and displayed in the "Layout Properties" page.
  • The GDS reader now is somewhat less strict and also accepts certain broken versions (i.e. missing ENDEL records).
  • Several bug fixes related to scripting applications: Proc objects are held by the application now, Application does not abort in non-GUI mode in operations that take some time and try to display a progress bar.
  • DXF bugfix: layer names now do no longer contain blanks which made files unreadable by other tools like AutoCad.
  • Bugfix: foreground objects (i.e. rulers) are now correctly rendered in printout.

Version 0.21.15

Release date: 2012-01-22

Packages:   klayout-0.21.15.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21.15-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21.15-win64-install.exe (WIN64 installer)


  • Bugfix: the correct initial cell now is selected. Formerly, the largest cell was selected even it is was not a top cell.
  • "Show only selected" in the layer panel does not clear the selection any longer.
  • GDS reader now is less strict with respect to record order of STRANS, MAG and ANGLE.
  • Excellon drill file reader is now conforming to the specification in many respects.
  • Instances are not selected if the cell does not contain shapes in visible layers.
  • Marker browser does now work correctly when layer view transformations are present.
  • DXF reader enhancements: read LAYER table and assign GDS layers in that order, except for layer which got a layer name through their name (i.e. L1D100). Bugfix: don't suppress INSERT's if the layer is not mapped. Write TEXT and MTEXT correctly (multi-line support, small chunks for MTEXT, character alignment). New option: keep all cells for DXF reader. Added elliptic interpolation edge type (not really tested yet). HATCH objects with bulges and various edge types are implemented now. MTEXT supported now. New option: convert text to polygon for unicode support.
  • Changed default sorting of layers: always sort by layer number first, even if there is a name. If there is no layer number, sort by name.

Version 0.21.14

Release date: 2011-11-28

Packages:   klayout-0.21.14.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21.14-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21.14-win64-install.exe (WIN64 installer)


  • "Synchonized views" and "Select top level only" configuration shortcuts added to the "Views" menu.
  • Gerber reader bugfixes and enhancements: less strict parsing of aperture definitions, rotation of aperture macro elements is not considered correctly. Enhanced drill file reader.
  • Disabled cell copy & paste in viewer mode (was not working correctly).
  • Bugfix: it was possible to create an invalid configuration when removing all default stipples (lead to a crash on the next KLayout start).
  • Bugfix: an error appeared when switching the tabs in the layer panel in certain configuration involving groups.
  • Correct initialization of ruby interpreter to support Ruby 1.9.2 and later.
  • Bugfix: marker browser was only partially reporting collected markers for certain categories.
  • XOR now has an option to make use of multiple cores using a configurable number of threads.
  • Bugfix: reset of configuration required a restart.
  • Bugfix: OASIS reader now is more robust against overflow for g-deltas.
  • GDS reader enhancement: An invalid angle (outside the range of -360 to 360 degree) now is no longer an error and the angle is automatically restricted to the valid range.

Version 0.21.13

Release date: 2011-09-19

Packages:   klayout-0.21.13.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21.13-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21.13-win64-install.exe (WIN64 installer) (MacOS 10.7)


  • A bug in the clip function was fixed which was related to empty cells (reported in the forum)
  • By default, the first level of hierarchy is shown now if a new layout is opened. That feature can be adjusted using the "Default levels of hierarchy" setting on the "General" page in the setup dialog.
  • For multiple top cells, the cell with the larges footprint is selected initially.
  • A simple print function (available in the "File" menu)
  • Support for command 93 in CIF (AREF)
  • Improved handling of single point paths. In particular with round ends. They now render a circle in OASIS. In reverse, OASIS circles now render single-point paths with round ends in GDS.
  • Ruby scripts now work more reliably under ruby 1.9 (i.e. Windows binary). Formerly, some operations failed due to improper initialization of the encoding system (i.e. Dir.glob).
  • Clean uninstaller under Windows (removes all registry entries).

Version 0.21.12

Release date: 2011-07-29

Packages:   klayout-0.21.12.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21.12-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21.12-win64-install.exe (WIN64 installer)


  • Bugfix: GDS2Text format was not recognized correctly in some cases.
  • Texts: strings with line breaks can be edited now (line breaks are shown as \n). Text size is shown more realistic now. Alignment flags are supported in GDS2 and can be edited now.
  • Layer and datatype is shown in addition to OASIS layer names in the layer list. The old behaviour can be configured by unchecking the "Always show layer and datatype" checkbox on the "Layers" page in the setup dialog.
  • For most file dialogs, the specific filter is the default now (i.e. "*.lyp" is default instead of "All files" for the layer properties file dialogs.)
  • There is a "all layout files" filter for the layout file selection dialogs.

Version 0.21.11

Release date: 2011-06-26

Packages:   klayout-0.21.11.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21.11-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21.11-win64-install.exe (WIN64 installer)


  • Bugfix: command line option -p was not working correctly.
  • Bugfix: writing layouts with large coordinates was producing invalid OASIS files in some cases.
  • The tarkit now contains the files necessary for a build with Visual Studio on Windows.

Version 0.21.10

Release date: 2011-05-07

Packages:   klayout-0.21.10.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21.10-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21.10-win64-install.exe (WIN64 installer)


  • Bugfix: content of cell was not shown correctly when the cell was moved.
  • Bugfix: PCB import was not working properly (Bottom mounting mode was broken, top cell and dbu were not set correctly when a PCB project file was imported directly).
  • Bugfix: RVE reader was not correctly handling check names with a dot.

Version 0.21.9

Release date: 2011-04-20

Packages:   klayout-0.21.9.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21.9-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21.9-win64-install.exe (WIN64 installer)


  • Bugfix: Loading of layer files with tabs was not working properly: the first tab's name was discarded.

Version 0.21.8

Release date: 2011-04-06

Packages:   klayout-0.21.8.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21.8-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21.8-win64-install.exe (WIN64 installer)


  • Bugfix: navigator was broken. It was not functional if KLayout was closed with the navigator open.

Version 0.21.7

Release date: 2011-03-24

Packages:   klayout-0.21.7.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21.7-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21.7-win64-install.exe (WIN64 installer)


  • DXF bugfixes (arc interpolation of polylines).
  • Performance enhancement of "test for shapes in view" feature of layer list.

Version 0.21.6

Release date: 2011-02-20

Packages:   klayout-0.21.6.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21.6-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21.6-win64-install.exe (WIN64 installer) (MacOS 10.6)


  • DXF enhancements (support for bulges for polylines).
  • Bugfix: RBA::Edge.intersect? reports intersections correctly also if edges are collinear.
  • Performance bugfix: selection was slow for certain cases of hierarchy.

Version 0.21.5

Release date: 2011-02-03

Packages:   klayout-0.21.5.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21.5-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21.5-win64-install.exe (WIN64 installer)


  • DXF enhancements (some polylines now have the correct width).
  • An option to select how instances are placed (at origin or lower left corner of bounding box).
  • Bugfix: when placing an instance at the lower left bounding box corner, it is guaranteed that the origin is on grid.
  • Stable operation on UTF-8 filesystems and with non-english locales on Linux (i.e. consistent use of dot as decimal point). However, UTF-8 file names are not correctly displayed although the file is opened correctly. This will be fixed in the next major release.

Version 0.21.4

Release date: 2011-01-19

Packages:   klayout-0.21.4.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21.4-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21.4-win64-install.exe (WIN64 installer) (MacOS 10.6)


  • Correct installation of the image reader plugins for the Windows packages.
  • Bugfix: rotate counterclockwise was clockwise and vice versa.
  • Bugfix: "draw border instances of arrays" feature was broken.
  • Fixed a ruby crash on some systems (related to an initial 'require' on a ruby module loaded with -rm).
  • CIF reader enhancement: "DS" statements are now accepted with a single value also.
  • The Windows installation now also includes the standard Ruby modules.

Version 0.21.3

Release date: 2010-12-27

Packages:   klayout-0.21.3.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21.3-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21.3-win64-install.exe (WIN64 installer) (MacOS 10.6)


  • DXF reader and writer enhancements. The reader now allows to specify how POLYLINE entities are read. In most cases, the "Automatic" mode will be appropriate. The writer was enhanced by providing an option which determines how to write polygons. The default method is POLYLINE. A comprehensive description of the DXF format, as KLayout understands it, together with a description of the modes, is given here.

Version 0.21.2

Release date: 2010-12-19

Packages:   klayout-0.21.2.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21.2-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21.2-win64-install.exe (WIN64 installer)


  • RBA bugfix: RdbItem.each_value was not working on const references.
  • DXF reader and writer enhancements for improved interoperability with other tools.
  • Unit option for DXF input (to specify the units of the drawing).
  • Bugfix: layer mapping was not working correctly for DXF and CIF output.

Version 0.21.1

Release date: 2010-12-06

Packages:   klayout-0.21.1.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21.1-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21.1-win64-install.exe (WIN64 installer) (MacOS 10.6)


  • Added cell margins for fill utility.
  • A couple of bugs fixed (related to Diff tool, marker database reader, Ruby scripting).
  • Source is compatible with earlier versions of Qt now (down to 4.2.3).
  • Bugfix: persistency of reader options was broken.
  • Enhanced DXF and CIF reader and writer functionality with improved compatibility with other systems.

Version 0.21

Release date: 2010-11-28

Packages:   klayout-0.21.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.21-win32-install.exe (WIN32 installer) (WIN64 binaries and DLL's)
klayout-0.21-win64-install.exe (WIN64 installer)


  • Support for DXF format (reading and writing).
    ASCII and binary format are supported. There is an open issue how to represent layouts with multiple top cells. Currently, the ENTITY section is always empty and all cells are put into BLOCKS sections.
    DXF units will be micron and the database unit must be selected manually when layouts are read.
  • Support for CIF format (reading and writing).
    There is an open issue how to deal with paths. By default, CIF states that paths are supposed to have round ends. Obviously that interpretation is not commonly used. Options are provided which control how path objects are read and written.
  • Tabs for the layer panel. This feature is explained here.
  • Flat cell list and cell list sorting modes. The feature is explained here.
  • Dockable tool boxes.
    Layer list, cell list, layer toolbox and navigator are now dockable and can be dragged to another location, torn off the main window or closed with Qt's standard dockable window controls. The position and the state of the dockable windows is saved in the settings and session files.
  • A ruler embedded in the background image.
    Now, a small ruler is embedded into the background which shows the dimension scale similar to a map. It can be disabled in the setup dialog on the "Display/Background" page.
  • Image quality enhancement by oversampling. The feature is explained here.
  • The "Diff" tool. The Diff tool produces a marker database containing a description of the differences. A detailed description can be found here.
  • Snapping to objects is provided as an option for edit mode. In this mode, the mouse snaps to vertices and edges of visible objects. This mode can be enabled with the "Objects" checkbox on the "Editor Options" page (F3 key or "Edit/Editor Options" menu).
  • The reference point for the placement of instances now is the lower left point of the placed cell's bounding box, not the origin.
  • Dialog geometry persistent now.
    Marker, shape and instance browsers now save their geometries and splitter pane configurations when the application exits.
  • Instance placement now uses bbox origin, not cell origin.
    This simplifies placement of cells with their origin not aligned with the content.
  • Fill (tiling) tool. The tool is found in "Edit/Utilities/Fill Tool". A detailed description can be found here.
  • In some places, particular in the ruler display string, expressions can be used. For rulers, the previous display string placeholder scheme is replaced by the more powerful expression expansion scheme (see Ruler properties for details).
  • Build support for VC++ and Visual Studio 2010. The Windows 64bit build now is based on that environment. Note: Visual Studio 2010 no longer supports Windows 2000. To use KLayout on Windows 2000, a legacy build based on MinGW is provided.

Version 0.20.2

Release date: 2010-05-25

Packages:   klayout-0.20.2.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.20.2-win32-install.exe (WIN32 installer) (experimental - WIN64 binaries and DLL's) (MacOS 10.6)


  • Bugfix: marker browser crashed when opened from menu and the maximum number of markers was set differently from default.

Version 0.20.1

Release date: 2010-05-23

Packages:   klayout-0.20.1.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.20.1-win32-install.exe (WIN32 installer) (experimental - WIN64 binaries and DLL's)


  • Navigator now allows to drag a zoom box in the usual way.
  • Paths with odd width (in database units) are shown correctly.
  • Some bugfixes (for a list of fixed bugs see Known bugs in version 0.20) concerning the net tracer and the Gerber import feature.
  • Support for Ruby 1.9 (experimental).
  • Support for 64 bit Windows (experimental).

Version 0.20

Release date: 2010-05-01

Packages:   klayout-0.20.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.20-win32-install.exe (WIN32 installer)


  • Import option for Gerber PCB data ("File/Import" menu entry). Details about this function can be found in the Importing Gerber PCB files section in the advanced features manual.
  • A function to import another stream file into the current file. This avoids having to use copy & paste and provides a couple of nice options. Details about this function can be found in the Importing other layout files section in the advanced features manual.
  • A simple XOR tool providing a flat XOR between two layouts. A tolerance can be set to suppress small deviations. A tiling option is provided to reduce memory requirements for large layouts. The flat approach probably limits the application to "almost flat", small to medium sized layouts. Details about this function can be found in the The XOR tool section in the advanced features manual.
  • A net tracing tool to trace single nets of conductive layers connected through via shapes. The function is intended for extracting single small nets and it's not performance optimized for the case of huge power nets. Details about this function can be found in the The net tracing feature section in the advanced features manual.
  • A navigator window that shows current view's rectangle and allows to control the rectangle by dragging or resizing it.
  • Multi threading support for drawing increases the drawing performance on multi-core CPU's by rendering different layers on different CPU's. The number of threads to use can be set in the setup dialog in the "Display" group under "Optimizations". By default, a single thread is used.
  • "Make array" method ("Edit/Selection" menu) to multiply the selection into an array arrangement.
  • A function to add a layout already loaded to a view ("File/Pull In Other Layout").
  • A function to scan a layer's geometry and create a marker database from that. The menu function is found in the "Tools/Verification" menu. It will scan all selected layers either flat or hierarchical and create a marker database containing the shapes as markers.
  • Layer mapping on input: the reader options now allow to specify a mapping together with a layer specification. In addition to specifying the layers to read, a target can be given which specifies which layer the shapes will be stored under (See "Reader Options" dialog found in the "File" menu).
  • A couple of new display options:
    • Abstract mode (shows only the outer interfacing shapes of child cells.
    • Child hierarchy level layout can be configured to be shown in different brightness, hollow fill or static neutral color to differentiate top level from bottom level layout.
    • Enhancements for the hierarchy level specifications in the layer source notation.
  • A log viewer is provided to catch warning messages. The menu entry to open the log viewer is found in the "File" menu.
  • The setup dialog has been reorganized to make room for more property pages.
  • Instances now show the cell's content when being moved instead just a rectangle. This feature can be disabled.
  • Various usability enhancements (i.e. mouse cursor now shows activity, status bar shows short shape statistics etc.).
  • An option to not write empty cells.
  • Support for missing cells in the input layout: those cells get marked and are not produced in the output unless they have received content. That allows to load and save layouts with missing cells without producing empty cells for those missing cells.
  • Some new functions in the layer list context menu ("Show All", "Hide All", "Show Only Selected").
  • Various bug fixes (i.e. for clip function).
  • A couple of new RBA methods.

Version 0.19.3

Release date: 2009-12-17

Packages:   klayout-0.19.3.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.19.3-win32-install.exe (WIN32 installer)


  • Some bugfixes (for a list of fixed bugs see Known bugs in version 0.19.2).
  • To specify the installation path (where the ".rbm" files are looked up), a new environment variable "KLAYOUT_PATH" is provided. This variable currently supports a single entry only. In that sense it's not a "path" right now.

Version 0.19.2

Release date: 2009-12-05

Packages:   klayout-0.19.2.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.19.2-win32-install.exe (WIN32 installer)


Version 0.19.1

Release date: 2009-11-30

Packages:   klayout-0.19.1.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.19.1-win32-install.exe (WIN32 installer)


Version 0.19

Release date: 2009-11-21

Packages:   klayout-0.19.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.19-win32-install.exe (WIN32 installer)
klayout-0.19-mac-leopard.tgz (Universal binary for MacOS 10.5.7 including Qt)


  • Images: it is possible now to load image files (JPG, GIF, TIFF etc.) and display them below the drawn layout. The display of the images can be adjusted in many ways, i.e. placement, scaling, rotation, mirroring, color/contrast/brightness adjustments and false color mapping for gray level images. Images are fully supported by RBA.
    The feature is described in detail in Adding images.
  • Marker browser: the marker browser is based on the report database (RDB). This is a new concept that has been introduced as a container for report items, in particular marker objects but also for a number of additional annotations including screenshots for documentation. An import of Calibre DRC databases is provided. The RDB is fully supported by RBA.
    The feature is described in detail in The marker browser.
  • Some enhancements for the layer views: invisible layers are now shown differently in a "collapsed" way. Thus, the layer's colors and styles are still recognizable. The new features are described in detail in Telling used from unused layers.
  • In the layer list, unused layers can now be hidden and layers without shapes in view can be marked unused or hidden. The normal mode of marking layers unused when the cell does not contain any shapes at all is still available. Both modes are available as checkable items in the layer list's context menu.
  • A "View" menu has been added with fast access to certain display options, i.e. turn grid on an off. A number of default grids can be defined for quick selection in the "View" menu. On request, the tool bar can now be hidden as well as the layer and hierarchy lists.
  • A key binding editor is provided. This way, all menu functions can be assigned arbitrary key shortcuts in a more comfortable ways.
  • The mid mouse button can be used to pan (drag) the view window now.
  • Various RBA enhancements, i.e. a method to compute the intersection point between edges.

Version 0.18.2

Release date: 2009-11-05

Packages:   klayout-0.18.2.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.18.2-win32-install.exe (WIN32 installer)


  • Enhancements for building with gcc 4.4.x and Qt 4.5.x.
  • OASIS reader now also supports text objects with forward references to text string definitions.

Version 0.18.1

Release date: 2009-08-02

Packages:   klayout-0.18.1.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.18.1-win32-install.exe (WIN32 installer)
klayout-0.18.1-mac-leopard.gz (Universal binary for MacOS 10.5.7 - requires Qt 4.5.2)


Version 0.18

Release date: 2009-07-07

Packages:   klayout-0.18.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.18-win32-install.exe (WIN32 installer)


  • Some bugfixes (for a list of fixed bugs see Known bugs in version 0.17.2).
  • Added support for the GDS2 text format. This is a contribution by Romain Gauci from Oscillated Recall Technology (
  • Session persistence: sessions (files, layers, bookmarks, setup) can be saved and restored. Details for this feature can be found here.
  • Reader options can be specified in a dialog now (File menu). Some GDS2 specific reader options are available: allow multi XY, allow big records and several box record handling modes. Details for this feature can be found here.
  • GDS2 specific writer options (max vertex option, multi XY record option, max cell name length).
  • The stipple palette now is editable. A corresponding page has been added in the setup dialog.
  • Flatten cell function. A cell can be flattened which will remove the cell and all the subcells unless not specified otherwise. This function can be found in the cell's context menu. Details for this feature can be found here.
  • The 'Make Cell' operation provides a nice origin now. Before, the origin of the new cell was far off sometimes.
  • Accept drag & drop of .lyb, .lys, .lyp, .rb, .rbm and layout files.
  • Switched to standard file dialogs where this has not been the case yet. In particular on the Windows platform, the application will behave somewhat more consistent.
  • Added an option to draw only border instances of arrays. This option can be found on the 'Misc.' tab of the setup dialog.
  • Added the capability to define global ruby modules using the ".rbm" extension and putting them into the installation directory.
  • Full cell copy & paste functions can now be found in hierarchy panel context menu.
  • Enhancement of grid snapping in partial mode. Before, a offgrid vertex could not be brought on-grid because movement was confined to grid steps.
  • Number of points for polygons is shown now in the polygon property dialog.
  • Hole resolution for GDS2 and OASIS writer. Before, polygons with holes (which can be produced by scripts) were rejected.
  • Some bugfixes for clip, using booleans for clip to overcome some problems with hole connectors and spikes - slow but safe..
  • '#' character is not longer used when creating cell variants - instead '$' is used to enhance the compatibility with other tools which do not allow the "#" character as part of cell names.
  • On paste, a 'fit selection' is done to show what has been pasted.
  • Mouse wheel mode is configurable now (shift/ctrl modifier behaviour). The 'alternative mode' can be found on the 'Misc.' tab in the setup dialog.
  • Option to clear all rulers when cell is changed. This option can be found on the 'Misc.' tab in the setup dialog in the 'On Cell Change' group.

RBA enhancements:

  • A new class: ICplxTrans and related functions.
  • A recursive shape iterator simplifies hierarchical region queries and "as if flat" traversal of cells.
  • Polygon: hull and hole can be assigned now, compress method, point accessors.
  • The installation path now is available.
  • Added a method which allows to display a message in the status bar.
  • The transient selection now is available for RBA procedures.
  • New events are generated if selection and transient selection changes.
  • Added a generic assign method for copyable objects.
  • Added new classes 'LayerMap' and 'LoadLayoutOptions'.
  • Added two 'read' methods to Layout class.
  • Added a couple of methods to 'LayerInfo' (constructors, compare, ...).
  • Added a 'load_layout' method to LayoutView.
  • Added more cm_* methods to MainWindow.

Version 0.17.2

Release date: 2009-04-20

Packages:   klayout-0.17.2.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.17.2-win32-install.exe (WIN32 installer)


  • Some bugs are fixed now (for a list of fixed bugs see Known bugs in version 0.17.1).
  • The GDS2 writer now normalizes AREF records. This way compatibility with other EDA systems is enhanced.

Version 0.17.1

Release date: 2009-03-27

Packages:   klayout-0.17.1.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.17.1-win32-install.exe (WIN32 installer)


Version 0.17

Release date: 2009-03-23

Packages:   klayout-0.17.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.17-win32-install.exe (WIN32 installer)


  • Various layer operations are now available: boolean operations (AND, XOR, NOT), layer merge and sizing. For a detailed description see Layer boolean operations and Layer sizing. These operations are also available in RBA (see RBA::EdgeProcessor and RBA::ShapeProcessor).
  • Boolean and sizing operations are also available Shapewise boolean operations and Shapewise sizing.
  • Objects can now be aligned. For a detailed description of the alignment function see Object alignment.
  • The cell origin can be adjusted relative to the cell's bounding box. For a detailed description see Cell origin adjustment.
  • A 'corner rounding' function has been implemented to support soft-cornered layout which is common in power applications. For a detailed description see Corner rounding.
  • Various layer operations are now implemented in edit mode: clear layer, delete layer and edit layer properties. For a detailed description see Layer operations: clear, delete, edit specification.
  • The selection can now be scaled (The "Scale" function is available in the "Selection" submenu of the "Edit" menu).
  • An option is available that allows to select all hierarchy levels automatically when a cell is opened (found in the "Misc." tab of the setup dialog: "Select all hierarchy levels" must be checked).
  • Various bug fixes (i.e. see Known bugs in version 0.16.1).

Version 0.16.1

Release date: 2009-01-07

Packages:   klayout-0.16.1.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.16.1-win32-install.exe (WIN32 installer)


Version 0.16

Release date: 2008-12-27

Packages:   klayout-0.16.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.16-win32-install.exe (WIN32 installer)


  • Some new editing capabilities: flatten, make cell, clear layer and a clip function.
  • Some RBA extensions, in particular the ability to modify layout by deleting shapes and instances, replacing and transforming them, changing property handles etc.
  • Support for global preset of configuration (through a file called "layviewrc" beside the executable binary) and a global RBA initialisation file (a file called "rbainit" beside the executable binary).
  • Transient selection: indicates by a faint selection marker what object is below the mouse (can be disabled).
  • The layer specification (layer, datatype, name) can be now be edited which allows to move a complete layer to a different one.
  • Undo buffering can now be disabled on the command line with the '-i' option. This saves the memory otherwise required for storing the replay information.
  • Directional constraints can be modified by using the Shift and Ctrl modifiers on various operations such as rulers, movement, drawing etc.
  • Now there is a 'most recently used' list ("Open Recent" in the "File" menu) which shows the last layouts opened for easy re-opening.
  • Reduced memory requirements for particular OASIS constructs (random repetitions)
  • The instance browser now has a "Choose cell" button where the cell can be chosen whose instances will be presented.
  • For most editing operations, the status bar will now indicate more detailed informations such as move distance.
  • Pasted shapes and instances now are selected initially.
  • Enhanced OASIS compression mode (can be chosen from the options dialog on saving). Reduces file size considerably by creating regular shape arrays if possible at the cost of higher memory consumption and longer writing times.
  • Various bug fixes (i.e. see Known bugs in version 0.15).

Version 0.15

Release date: 2008-08-16

Packages:   klayout-0.15.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)
klayout-0.15-win32-install.exe (WIN32 installer)


  • Editing capabilities. "klayout" in it's basic form still operates as pure viewer. However, a mode is available that enables editing capabilities. See Editor mode quickstart manual for a more detailed description
  • Some RBA extensions: i.e. conversion from "double" type polygons to "integer" type ones.
  • A default layer table can be configured in the "Application" tab of the setup dialog. This table will be loaded whenever a layout is opened or created.
  • A installer for Windows is provided now.
  • Properties are supported on instances now as well.
  • Code is compatible with gcc 4.3.0 now.
  • Enhanced compatibility with SunStudio 11 compiler (in particular in RBA).
  • Various bug fixes (i.e. in GDS reader and OASIS writer).

Version 0.14

Release date: 2008-04-04

Tarkits:   klayout-0.14.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)


  • Several RBA extensions: i.e. alternative methods replacing different 'new' variants by one 'new'. Markers now can be filled.
  • Fixes for the bugs mentioned in the issues list.
  • OASIS and GDS writing capabilities. Menu functions are provided to save a layout and single cells as well as RBA extensions that allow to write a layout. See Saving a layout or parts of it for details.
  • Rulers and markers are drawn with a thin halo in background color to enhance their visibility. This can be switched off in the setup dialog if this is not desired. The following screenshots illustrate the differences:
    With haloWithout halo

Version 0.13

Release date: 2008-01-16

Tarkits:   klayout-0.13.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)


  • A couple of RBA extensions: API's for shape properties, rulers and geometry selections.
  • A bugfix for the OASIS reader (sometimes crashing the reader on CBLOCK-compressed input)
  • A function to descend into a cell in the hierarchy but keeping the context, which is shown in dimmed colors. This function can be found in the "Display" menu and is called "Descend". To use this function, select a shape or instance inside the cell into which to descend. "Descend" then enters the next cell along the path that leads to the selected shape or instance.
  • The mouse wheel can be used to zoom in and out.
  • Shift+right mouse button pressed now allows to "drag" layout in a "Google maps" fashion.
  • Copy & paste now is available for layers as well.
  • A ruby console is provided where ruby commands can be executed interactively.
  • The way how the selection is displayed can be configured now (color, line width and vertex size).
  • The interrupt signal now is enabled again even if Ruby is activated (Ctrl+C now works again).

Version 0.12

Release date: 2007-11-02

Tarkits:   klayout-0.12.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)


  • Support for arbitrary angles on cell instances.
  • A bugfix for the OASIS reader (CTRAPEZOIDS have not been read in some cases). The OASIS reader now uses shape arrays to achieve are smaller memory footprint in some cases.
  • Multiple transformations are now allowed on layer source expressions (see Transforming views and property selectors for a detailed description).
  • Rulers now are configurable to a large extent. Multiple ruler templates may be defined from which a certain ruler type can be chosen. Some of the new ruler styles are no longer "rulers" but rather "annotations". See Ruler properties for a description of that feature.
  • Last, but not least: KLayout now can be scripted to some extend using Ruby as the scripting language. For more information about this feature, see RBA introduction.

Version 0.11

Release date: 2007-06-26

Tarkits:   klayout-0.11.tar.gz (Sources for all systems) (WIN32 binaries and DLL's)


  • Some bugs were fixed in the OASIS implementation. CBLOCK compression now is supported. Forward cell name references (numerical ID is used before being associated with a string) are supported as now. File global properties are now read correctly. A bug reading certain CTRAPEZOID objects was fixed.
    (Still, forward references are not allowed for text/property strings or property names).
  • A layout properties dialog has been added that shows basic properties of the layout such as top cells, layers and others.
  • The "Select Cell" dialog has been enhanced with the capability to hide and show multiple cells in the cell list.
  • A "zoom fit" mouse gesture was implemented: moving the mouse up and right with the right mouse button pressed now fits the current cell into the window. Moving up and left still zooms out.
  • A bug in the GDS2 reader, dropping polygon points in rare cases, was fixed

Version 0.10

Release date: 2007-05

Tarkit: klayout-0.10.tar.gz


  • The build script has been enhanced and supports Qt installations with different locations for binaries, libraries and headers. See the Build section for details about this.
  • OASIS files can be read as well now. The reader automatically determines the kind of file. OASIS layer names are supported. Due to the complexity of the OASIS specification, or more precisely the effort required to test a reader for meeting the specification, OASIS support currently is regarded to be in "beta" state.
  • Layers can now be organized hierarchically. Layers can be grouped which allows to control visibility and other properties for the group as a whole. Layers can be removed from the layer view list or new layer views can be created.
  • The layout can be transformed (rotated, shifted, mirrored) now. This transformation is specified in the layer panel as a part of the layer source specification. An optional transformation can be applied per layer or layer group. This way for example, different layouts can be aligned over each other.
  • Shape properties now are supported. Each shape may carry optional properties that are read from GDS or OASIS files. A property selector can be applied per layer view, so that a layer only shows these shapes that match the given property selection.
  • As an experimental feature, the inverse layout tree can be visualised by allowing the minimum hierarchy level to go into the negative range. The effect of this is, that a cell is shown in the context of all of it's direct parents, if the first hierarchy level is set to -1. If set to -2, the cell is shown in the context of all of it's parents and grandparents and so on. Since there is no particular optimization for this feature, performance may be poor, if a cell must be painted in a huge number of contexts. In addition, the context displayed does not participate in selection or ruler snapping.

Version 0.9

Release date: 2006-04

Tarkit: klayout-0.9.tar.gz

This was the first official release