head to head · open source
LibreOffice vs KillerPDF
LibreOffice has 4,375 GitHub stars, 945 forks, 0 open issues and last shipped yesterday. KillerPDF has 3,879 stars, 307 forks, 38 open issues and last shipped 4 days ago. LibreOffice leads on adoption by 13% (4,375 vs 3,879 stars). LibreOffice is written in C++ under GPL-3.0; KillerPDF is written in C# under GPL-3.0. LibreOffice has attracted 22% as many forks as stars, KillerPDF 8%. LibreOffice was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| LibreOffice | KillerPDF | |
|---|---|---|
| GitHub stars | ★ 4.4K | ★ 3.9K |
| License | GPL-3.0 | GPL-3.0 |
| Written in | C++ | C# |
| Last push | 2026-09-18 | 2026-09-15 |
| Forks | ⑂ 945 | ⑂ 307 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick LibreOffice if
- You weight community size — 4.4K stars and counting
- You want the GPL-3.0 license terms
- Your stack matches C++
- You value the larger contributor base for long-term maintenance
pick KillerPDF if
- You want the KillerPDF feature set and don't need the biggest community
- You prefer the GPL-3.0 license terms
- Your stack matches C#
- You evaluated both and KillerPDF fits your workflow better
About LibreOffice
LibreOffice is an integrated office suite written in C++ and distributed under GPL 3.0. It lives in the open source productivity and office suite ecosystem, and it positions itself as an open alternative to Microsoft 365. The Document Foundation backs the project as a community of enterprises, developers, and volunteers.
read the full LibreOffice overview →
About KillerPDF
KillerPDF is a free, open source PDF editor for Windows, built in C under the GPL 3.0 licence, that gives individuals and teams a complete view annotate OCR edit sign workflow without an Adobe subscription and without sending document processing off the machine.
read the full KillerPDF overview →
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Frequently asked questions
Is LibreOffice or KillerPDF more popular?
LibreOffice has 4,375 GitHub stars and KillerPDF has 3,879. LibreOffice has the larger community by that measure.
Are LibreOffice and KillerPDF free?
Both are open source. LibreOffice is licensed under GPL-3.0 and KillerPDF under GPL-3.0. Neither carries a licence fee.
What is the difference between LibreOffice and KillerPDF?
LibreOffice is written in C++ and KillerPDF in C#. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, LibreOffice or KillerPDF?
Choose LibreOffice if you want the larger community (4,375 stars) or its GPL-3.0 licence terms. Choose KillerPDF if its feature set, stack or GPL-3.0 licence fits better. Both are self-hostable.