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PaperKnife+ vs PDF Unlocker: catalog facts
PaperKnife+	PDF Unlocker
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the Apache 2.0 licence.
Android	Android
Works fully offline with no trackers Merge, split, rotate and rearrange pages	Processing stays on the device No account required
Android only No text editing or annotation listed	Requires the correct password; it does not crack PDFs Android only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: Apache-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.