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pdfsizeopt vs iLovePDF: catalog facts
pdfsizeopt	iLovePDF
Free Free and open source.	Freemium A limited free tier is available. Premium is a paid subscription.
Windows, Linux, Command line	Android, iOS, Web
Lossless size reduction Docker image available	Covers nearly every routine PDF task with no software to install Mobile apps and an API alongside the web tools
Command-line only Updates are infrequent	Files are uploaded to their servers to be processed Free use is limited by file size and daily task count
Downloadable app	Web application
Open source	Closed source
License: GPL-2.0	License not stated
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.