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Qpdf Tools vs pdfsizeopt: catalog facts
Qpdf Tools	pdfsizeopt
Free Free and released into the public domain under the Unlicense.	Free Free and open source.
Linux	Windows, Linux, Command line
Compress, split, merge and rotate PDFs Works locally without uploading files	Lossless size reduction Docker image available
Covers basic tasks only, no editing or annotation Small project with few contributors	Command-line only Updates are infrequent
Downloadable app	Downloadable app
Open source	Open source
License: Unlicense	License: GPL-2.0
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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