head to head · open source
ONLYOFFICE Docs vs KillerPDF
ONLYOFFICE Docs has 7,081 GitHub stars, 1,327 forks, 1,135 open issues and last shipped 8 days ago. KillerPDF has 4,289 stars, 342 forks, 38 open issues and last shipped yesterday. ONLYOFFICE Docs leads on adoption by 65% (7,081 vs 4,289 stars). ONLYOFFICE Docs is written in Shell under AGPL-3.0; KillerPDF is written in C# under GPL-3.0. ONLYOFFICE Docs has attracted 19% 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
| ONLYOFFICE Docs | KillerPDF | |
|---|---|---|
| GitHub stars | ★ 7.1K | ★ 4.3K |
| License | AGPL-3.0 | GPL-3.0 |
| Written in | Shell | C# |
| Last push | 2026-10-26 | 2026-11-02 |
| Forks | ⑂ 1.3K | ⑂ 342 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick ONLYOFFICE Docs if
- You weight community size — 7.1K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches Shell
- 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 ONLYOFFICE Docs
Welcome to the ONLYOFFICE Docs repo! ONLYOFFICE Docs is a free collaborative online office suite comprising viewers and editors for texts, spreadsheets, presentations, forms, PDFs, and diagrams. It is fully compatible with Office Open XML formats (.docx, .xlsx, .pptx) and enables collaborative editing in real time. ONLYOFFICE Docs can be used as a part of ONLYOFFICE DocSpace and ONLYOFFICE Workspace, or with third party sync&share solutions (e.g. Odoo, Moodle, ownCloud, Seafile, etc.) to enable collaborative editing within their interface. ONLYOFFICE Docs is available in three tailored editions to suit your…
read the full ONLYOFFICE Docs 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 ONLYOFFICE Docs or KillerPDF more popular?
ONLYOFFICE Docs has 7,081 GitHub stars and KillerPDF has 4,289. ONLYOFFICE Docs has the larger community by that measure.
Are ONLYOFFICE Docs and KillerPDF free?
Both are open source. ONLYOFFICE Docs is licensed under AGPL-3.0 and KillerPDF under GPL-3.0. Neither carries a licence fee.
What is the difference between ONLYOFFICE Docs and KillerPDF?
ONLYOFFICE Docs is written in Shell 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, ONLYOFFICE Docs or KillerPDF?
Choose ONLYOFFICE Docs if you want the larger community (7,081 stars) or its AGPL-3.0 licence terms. Choose KillerPDF if its feature set, stack or GPL-3.0 licence fits better. Both are self-hostable.