This document is news about the most recent Ghostscript release. For earlier versions, see the history documents:

History of Ghostscript versions 9.n
History of Ghostscript versions 8.n
History of Ghostscript versions 7.n
History of Ghostscript versions 6.n
History of Ghostscript versions 5.n
History of Ghostscript versions 4.n
History of Ghostscript versions 3.n
History of Ghostscript versions 2.n
History of Ghostscript versions 1.n

For other information, see the Ghostscript overview.

Version 9.51 (2020-03-12)

Highlights in this release include:

  • 9.51 is primarily a maintainance release, consolidating the changes we introduced in 9.50.

  • We have continued our work on code hygiene for this release, with a focus on the static analysis tool Coverity (from Synopsys, Inc) and we are now maintaining a policy of zero Coverity issues in the Ghostscript/GhostPDL source base.

  • IMPORTANT: In consultation with a representative of (OpenPrinting) it is our intention to deprecate and, in the not distant future, remove the OpenPrinting Vector/Raster Printer Drivers (that is, the opvp and oprp devices.

    If you rely on either of these devices, please get in touch with us, so we can discuss your use case, and revise our plans accordingly.

  • IMPORTANT: We have forked LittleCMS2 into LittleCMS2mt (the "mt" indicating "multi-thred"). LCMS2 is not thread safe, and cannot be made thread safe without breaking the ABI. Our fork will be thread safe, and include performance enhancements (these changes have all be been offered and rejected upstream). We will maintain compatibility between Ghostscript and LCMS2 for a time, but not in perpetuity. If there is sufficient interest, our fork will be available as its own package separately from Ghostscript (and MuPDF).

  • The usual round of bug fixes, compatibility changes, and incremental improvements.

For a list of open issues, or to report problems, please visit

Incompatible changes

Included below are incompatible changes from recent releases (the specific release in question listed in parentheses). We include these, for now, as we are aware that not everyone upgrades with every release.

  • (9.50) There are a couple of subtle incompatibilities between the old and new SAFER implementations. Firstly, as mentioned in the 9.50 release notes, SAFER now leaves standard Postcript functionality unchanged (except for the file access limitations). Secondly, the interaction with save/restore operations, see SAFER.

    Important Note for Windows Users:
    The file/path pattern matching is case sensitive, even on Windows. This is a change in behaviour compared to the old code which, on Windows, was case insensitive. This is in recognition of changes in Windows behaviour, in that it now supports (although does not enforce) case sensitivity.

  • (9.27) The process of "tidying" the Postscript name space should have removed only non-standard and undocumented operators. Nevertheless, it is possible that any integrations or utilities that rely on those non-standard and undocumented operators may stop working, or may change behaviour.

    If you encounter such a case, please contact us (either the #ghostscript IRC channel, or the gs-devel mailing list would be best), and we'll work with you to either find an alternative solution or return the previous functionality, if there is genuinely no other option.

    One case we know this has occurred is GSView 5 (and earlier). GSView 5 support for PDF files relied upon internal use only features which are no longer available. GSView 5 will still work as previously for Postscript files. For PDF files, users are encouraged to look at MuPDF.


See the history file for complete log of changes.

Copyright © 2005-2020 Artifex Software, Inc. All rights reserved.

This software is provided AS-IS with no warranty, either express or implied. This software is distributed under license and may not be copied, modified or distributed except as expressly authorized under the terms of that license. Refer to licensing information at or contact Artifex Software, Inc., 1305 Grant Avenue - Suite 200, Novato, CA 94945, U.S.A., +1(415)492-9861, for further information.

Ghostscript version 9.51, 12 March 2020