About KillerPDF
Free. Open. No account. No subscription. No telemetry.
The Story
KillerPDF was built by a field technician who got tired of dealing with Adobe's bloatware. You know the drill — you just want to open a PDF, maybe add a signature or two, and suddenly you're waiting for a 500MB installation to finish.
So instead of complaining about it on forums (though there's plenty to complain about), this developer decided to do something about it. The result is KillerPDF: a lightweight, no-nonsense PDF tool that just works.
Philosophy
Open Source
Full source code available on GitHub. No hidden tricks, no mystery.
Free Forever
No subscription, no "pro" version with essential features locked away.
Privacy First
No telemetry, no analytics, no "phone home". Your PDFs stay on your machine.
Lightweight
Small download, fast startup. Built with .NET for reliability and performance.
Technology
KillerPDF uses PDFium for high-quality PDF rendering. PDFium is the same engine used by Google Chrome's built-in PDF viewer, ensuring excellent compatibility and rendering quality.
Built with C# and .NET Framework 4.8, KillerPDF runs on Windows 10 and 11 without requiring any additional runtime installation on modern systems.
License
KillerPDF is released under the GNU General Public License v3 (GPLv3).
This means you can freely use, modify, and distribute the software. If you make changes and distribute them, you must also release your source code under GPLv3.
Contributing
Found a bug? Have a feature request? Head over to the GitHub Issues page and let us know.
Pull requests are welcome! If you want to contribute code, please read the contribution guidelines in the repository.