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4K Image Compressor vs pdfsizeopt: catalog facts
4K Image Compressor	pdfsizeopt
Freemium Free download with a paid premium upgrade.	Free Free and open source.
Windows, macOS	Windows, Linux, Command line
Compress to a percentage or an exact target file size Batch processing of many images	Lossless size reduction Docker image available
Some features are reserved for the paid premium tier Closed source	Command-line only Updates are infrequent
Downloadable app	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 October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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