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pdfsizeopt vs Ghostscript: catalog facts
pdfsizeopt	Ghostscript
Free Free and open source.	Free Free and open source under the AGPL. Commercial licensing is sold separately.
Windows, Linux, Command line	Windows, macOS, Linux, Command line
Lossless size reduction Docker image available	Handles PostScript, PDF, PCL and XPS in one interpreter The de facto engine for PDF conversion and compression in print workflows
Command-line only Updates are infrequent	Command line with a famously cryptic option set Commercial redistribution requires a paid Artifex licence
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: AGPL-3.0
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 22, 2026

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