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

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