head to head · open source
LibreOffice vs KillerPDF
LibreOffice has 4,590 GitHub stars, 996 forks, 0 open issues and last shipped yesterday. KillerPDF has 4,289 stars, 342 forks, 38 open issues and last shipped yesterday. LibreOffice leads on adoption by 7% (4,590 vs 4,289 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%. KillerPDF 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 | ★ 4.6K | ★ 4.3K |
| License | GPL-3.0 | GPL-3.0 |
| Written in | C++ | C# |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 996 | ⑂ 342 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick LibreOffice if
- You weight community size — 4.6K 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 LibreOffice is an integrated office suite based on copyleft licenses and compatible with most document formats and standards. Libreoffice is backed by The Document Foundation, which represents a large independent community of enterprises, developers and other volunteers moved by the common goal of bringing to the market the best software for personal productivity. LibreOffice is open source, and free to download, use and distribute. A quick overview of the LibreOffice code structure. Overview You can develop for LibreOffice in one of two ways, one recommended and one much less so. First the somewhat…
read the full LibreOffice overview →
About KillerPDF
KillerPDF is a free, open source PDF editor for Windows. View, annotate, OCR, merge, split, edit text, draw, sign, fill forms, print, flatten, and open password protected PDFs without an Adobe subscription. Choose the compact Windows installer or the self contained portable edition. Document processing stays on your computer, with no telemetry. Full how tos live on the help page; internals, formats, and limits on the technical page. The KillerPDF.Engine KillerPDF 1.8 introduces The KillerPDF.Engine, an independent and reusable .NET library for PDF 2.0, PDF/A, and PDF/UA document processing. It is a first class…
read the full KillerPDF overview →
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Frequently asked questions
Is LibreOffice or KillerPDF more popular?
LibreOffice has 4,590 GitHub stars and KillerPDF has 4,289. 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 (4,590 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.