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