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PaperKnife

PaperKnife is a free, open-source reading app for Android. Privacy-first PDF utility (Zero-Server Architecture). It has 1,522 GitHub stars and is released under the AGPL-3.0 license. Its source code is on GitHub at potatameister/PaperKnife.

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About PaperKnife

A privacy-first PDF utility: merge, compress, sign, and protect. Works 100% offline — no servers, no trackers. All processing happens on your device. Your files never leave your phone.

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FAQ

PaperKnife FAQ

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Is PaperKnife free and open source?

Yes. PaperKnife's source code is public on GitHub under the AGPL-3.0 license, which is OSI-approved or FSF-free.

How do I install PaperKnife?

PaperKnife publishes releases on GitHub (latest: v1.1.0); download the build for your device from the repository's Releases page, or build it from source by following the README.

Is PaperKnife still maintained?

The repository's most recent commit was on Oct 1, 2026. appsgit only lists apps whose repository had a commit in the last six months.