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

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