KillerPDF vs word-sys PDF Editor
Comparing two open source alternatives to Adobe Acrobat and Adobe Acrobat Reader and Foxit Reader and Nitro PDF and PDF Expert. Use the comparison below to decide which one fits your needs.
KillerPDF
GPL-3.0KillerPDF is a lightweight, fully portable PDF editor for Windows. Edit, merge, annotate, and sign PDFs locally with no subscription, accounts, or hidden telemetry anywhere on your computer.
word-sys PDF Editor
GPL-3.0A free, open-source PDF editor for Linux that lets you edit text, images and objects, merge documents, and export to DOCX, PPTX and more.
Side-by-side comparison
| KillerPDF | word-sys PDF Editor | |
|---|---|---|
| License | GPL-3.0 | GPL-3.0 |
| Self-hostable | No | No |
| GitHub Stars | 4,035 | 114 |
| Forks | 319 | 3 |
| Open Issues | 48 | — |
| Last Commit | Oct 6, 2026 | Oct 5, 2026 |
| First Released | Apr 16, 2026 | Feb 15, 2025 |
| Categories | ||
| Tags |
Similar open source alternatives
PdfDing
Self-hosted PDF manager, viewer, and editor with multi-device sync, tagging, and an in-browser reader; deployable via Docker.
Adobe Acrobat
Sioyek
Cross-platform PDF viewer focused on textbooks and research papers with smart navigation, marks, bookmarks, and bibliography jumping.
Adobe Acrobat
PrintCraft
Open-source PDF workbench in pure Rust — read, organize, combine, split, comment and secure PDFs.
Adobe Acrobat
EmbedPDF
A PDF viewer that seamlessly integrates with any JavaScript project
Adobe Acrobat Reader
Pympress
Lightweight GTK PDF presenter for dual-screen setups, showing current slide, next slide, and presenter notes on separate displays.
Adobe Acrobat
SumatraPDF
Lightweight, free PDF, eBook, and comic reader for Windows that launches instantly and stays out of the way; multi-format support with minimal interface.
Adobe Acrobat