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mahlzahn
Robert Wolff @mahlzahn@nerdculture.de · Mar 16, 2026
Replying to on nerdculture.de
“Better safe than sorry” For release 0.5.0 of #Censor, a lot of work went into improving the security of PDF redaction. PDF documents are tricky, and irrevocably removing elements from them is even more. With this release, before saving a redacted document, garbage is now properly collected and documents are sanitized, which means that metadata, page thumbnails, etc. are removed. Also, vector graphics are now removed with a more strict option when they overlap with redaction rectangles. On top of that, I added redaction of PDF annotations. The user interface was refreshed: with undo and redo buttons in the toolbar and improved document saving experience. Drawing rectangles is now indicated by a crosshair cursor. Thanks to the translators, you may now talk also Czech with Censor! Get it from @flathub@floss.social: https://flathub.org/apps/page.codeberg.censor.Censor or contribute on @Codeberg@social.anoxinon.de: https://codeberg.org/censor/Censor #censorship #redaction #PDF #Codeberg #Flatpak #Flathub #GNOME #python #MuPDF #PyMuPDF #linux
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mahlzahn
Robert Wolff @mahlzahn@nerdculture.de · Mar 16, 2026
Replying to @mahlzahn@nerdculture.de
That said and celebrated ;), there are things that #Censor is not yet well redacting. The upstream library #MuPDF (with its #Python bindings in #PyMuPDF) supports by default only redaction of text, vector graphics and images. Testing on a variety of PDF files (thanks to #pypdf, #qpdf, #ghostscript, and their issue reporters, as well as @pdfarranger@fosstodon.org for their hint) let me discover that some vector graphics are not properly redacted and an upstream issue has been reported for that. Also, form fields (widgets), signatures and links may be incompletely redacted. You can find an updated list of “What is redacted? What not?” here: https://codeberg.org/censor/Censor/issues/120 #pdf #redaction #security
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mahlzahn
Robert Wolff @mahlzahn@nerdculture.de · Mar 24, 2026
Replying to @mahlzahn@nerdculture.de
“Secure #redaction by design and through extensive #testing” #Censor 0.6.0 comes with many more #security improvements, motivated by extensive testing on more then 1,000 #PDF document samples. You may now redact securely also links, form fields and widgets. In rare cases, when partial image redaction fails, the more secure full image removal is used instead. But even more important, Censor now warns you, when unsuccessful redaction is detected during postprocessing. This reduces the impact of known issues of unsecure redaction. Polish is the 11th language you may speak with Censor. Thanks to its translators (among them, @mondstern@mastodon.green)! Thanks a lot also to #pypdf, #qpdf, #pikepdf, #Ghostscript, #MuPDF, #PyMuPDF, and #poppler contributors for the great resource of PDF document samples! Find it at @flathub@floss.social: https://flathub.org/apps/page.codeberg.censor.Censor and @Codeberg@social.anoxinon.de: https://codeberg.org/censor/Censor #Censorship #Codeberg #Flathub #GNOME #Linux #Python
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mahlzahn
Robert Wolff @mahlzahn@nerdculture.de · Apr 09, 2026
Replying to @mahlzahn@nerdculture.de
“Zoom in, zoom out, redact your points!” #Censor v0.7.0 ships improved zooming with pinch-to-zoom gesture on touchpads and touchscreens and various security bug fixes. Find it at @flathub@floss.social: https://flathub.org/apps/page.codeberg.censor.Censor and @Codeberg@social.anoxinon.de: https://codeberg.org/censor/Censor You may now redact safely also #PDF documents with cropped, scaled, or rotated pages. The upstream #PyMuPDF library has some issues treating these documents. Thus, I implemented manual transformation and drawing of the redaction rectangles, and verified the proper redaction with a specially created sample document, submitted to the collection by #pypdf: https://github.com/py-pdf/sample-files/pull/36 Additionally, point- or line-like elements are now properly redacted. Sanitization during post-processing keeps now entries in form fields (note: this changes previous behavior). Thanks to the translators, Censor is now available in 13 languages including Croatian and Russian. #censorship #redaction #Codeberg #Flatpak #Flathub #GNOME #linux #python #MuPDF
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mahlzahn
Robert Wolff @mahlzahn@nerdculture.de · Apr 11, 2026
Replying to @mahlzahn@nerdculture.de
Good news for the #ArchLinux users among you: #Censor is now available in the #Arch User Repository (#AUR): https://aur.archlinux.org/packages/censor Your feedback is welcome! Already since version 0.3.0, Censor has been packed for #NixOS: https://search.nixos.org/packages?channel=unstable&show=censor Thanks to @pi_crew@social.project-insanity.org for maintaining! #pdf #redaction #linux #packaging #PKGBUILD #maintenance
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mahlzahn
Robert Wolff @mahlzahn@nerdculture.de · Apr 29, 2026
Replying to @mahlzahn@nerdculture.de
“Annotation censoring everywhere” #Censor, the #PDF document #redaction tool for the #GNOME desktop, got a minor update to v0.7.1. Find it at @flathub@floss.social: https://flathub.org/apps/page.codeberg.censor.Censor and @Codeberg@social.anoxinon.de: https://codeberg.org/censor/Censor Censor’s #Flatpak package comes with the latest version of the upstream library #PyMuPDF (1.27.2.3). This solves an issue with annotations that could not be redacted in some files. Thanks to Julian Smith from #Artifex for fixing it upstream. In case you do not use the Flatpak package, you may need to wait for your distribution maintainers to update PyMuPDF’s version. Hindi has been added to the languages you may now speak with Censor. Thanks to the translators! #censorship #Codeberg #Flathub #GNOME #linux #python #MuPDF
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mahlzahn
Robert Wolff @mahlzahn@nerdculture.de · Jul 10, 2026
Replying to @mahlzahn@nerdculture.de

#Censor, the #PDF document #redaction tool for the #GNOME desktop, was released in version v0.7.3. Find it at @flathub@floss.social: https://flathub.org/apps/page.codeberg.censor.Censor and @Codeberg@social.anoxinon.de: https://codeberg.org/censor/Censor or get it from your distribution package maintainers: https://repology.org/project/censor-document-redaction/versions (currently AUR, ALT Linux, and NixOS).

A bug was fixed that sometimes prevented files to be saved with the “Save” menu entry or associated keyboard shortcut Ctrl+S. Censor’s #Flatpak package comes with the latest version of the upstream library #PyMuPDF (1.28.0).

Three new languages have been added to Censor since the last announcement here: Basque, Swedish, and Ukrainian. Thanks to the translators! You may contribute to translations at https://translate.codeberg.org/engage/censor

#censorship #Codeberg #Flathub #GNOME #linux #python #MuPDF

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mahlzahn
Robert Wolff @mahlzahn@nerdculture.de · Jul 16, 2026
Replying to @mahlzahn@nerdculture.de
“Banish the ghosts” #Censor, the #PDF document #redaction tool for the @gnome@floss.social desktop, was released in version 0.8.0: https://codeberg.org/censor/Censor/releases/tag/v0.8.0 This version comes with major improvements to secure redaction of invisible elements: first, point- or line-like elements on page borders, and second, elements located outside of pages, quasi in infinity. These “ghosts” are now redacted or you’ll get warned during post-redaction-validation if redaction wasn’t possible. I discovered these issues in a few PDF documents after adding another big testing sample dataset, kindly provided by the #OpenPreservationFoundation: https://github.com/openpreserve/format-corpus Find Censor on @flathub@floss.social: https://flathub.org/apps/page.codeberg.censor.Censor and @Codeberg@social.anoxinon.de: https://codeberg.org/censor/Censor or get it from your distribution package maintainers: https://repology.org/project/censor-document-redaction/versions Thanks to its translators, Censor is currently available in 17 languages. I welcome your contribution to translations at #CodebergTranslate: https://translate.codeberg.org/engage/censor #censorship #Codeberg #Flathub #GNOME #GTK4 #linux #python #MuPDF #PyMuPDF
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mahlzahn
Robert Wolff @mahlzahn@nerdculture.de · Jul 23, 2026
Replying to @mahlzahn@nerdculture.de
“Preparing for the blackout” #Censor, the #PDF document #redaction tool, which allows you to draw black rectangles and permanently remove text and images below them, was released in version 0.9.0 (with a follow-up v0.9.1): https://codeberg.org/censor/Censor/releases/tag/v0.9.0 This version concentrates on draft and UI features. You can now save drafted redactions to the PDF document as PDF redaction annotations. Alternatively, you may export them to a JSON file, which may serve as a template for future redaction sessions. Censor’s welcome screen with new drop-file support and the keyboard shortcuts dialog were revised. On top of that, you may now censor in fullscreen mode. Find Censor on @flathub@floss.social: https://flathub.org/apps/page.codeberg.censor.Censor and @Codeberg@social.anoxinon.de: https://codeberg.org/censor/Censor or get it from your distribution package maintainers: https://repology.org/project/censor-document-redaction/versions Thanks to its translators, Censor is currently available in 18 languages. You may contribute to translations at https://translate.codeberg.org/engage/censor #censorship #Codeberg #Flathub #GNOME #linux #python #MuPDF #PyMuPDF
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mahlzahn
Robert Wolff @mahlzahn@nerdculture.de · Jul 26, 2026
Replying to @mahlzahn@nerdculture.de
RE: https://floss.social/@gnome/116985931040333333 This week, I presented #Censor and its latest release for the first time in This Week in #GNOME, or shortly #TWIG. You may find lot of nice first-hand reports there, and a few more screencasts of Censor in use, too (showing draft saving and redaction of non-PDF documents)! https://thisweek.gnome.org/posts/2026/07/twig-259/#third-party-projects
Quoting
GNOME @gnome@floss.social
Better colour management support in Loupe, Shortwave on Windows and MacOS! Oo7 gets closer to being production ready and much more in This Week in GNOME! #259 Color Management https://thisweek.gnome.org/posts/2026/07/twig-259/ #ThisWeekInGNOME #GNOME #TWIG
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mahlzahn
Robert Wolff @mahlzahn@nerdculture.de · Jul 30, 2026
Replying to @mahlzahn@nerdculture.de
“Pixel, pixel, on the page” #Censor, the #PDF document #redaction tool for @gnome@floss.social, which allows you to censor documents with high quality, was released in version 0.10.0: https://codeberg.org/censor/Censor/releases/tag/v0.10.0 This release features a paranoid document redaction option, that draws the redaction rectangles, and saves page snapshots as raster images to the PDF document. Open documents in multiple windows and enjoy seeing their file names and real host paths in the window headers, inspired by Graphs, Typesetter, and others: https://floss.social/@sstendahl/115866127726594764 If you find issues with Censor, don't hesitate to report them. You may now include the debugging information, available from the troubleshooting section of the about dialog. Thanks to its translators, Censor is currently available in 19 languages: https://translate.codeberg.org/engage/censor Find Censor at @flathub@floss.social: https://flathub.org/apps/page.codeberg.censor.Censor and @Codeberg@social.anoxinon.de: https://codeberg.org/censor/Censor #censorship #Codeberg #Flathub #GNOME #linux #python #MuPDF #PyMuPDF
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