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4K Image Compressor vs Squoosh: catalog facts
4K Image Compressor	Squoosh
Freemium Free download with a paid premium upgrade.	Free Free to use.
Windows, macOS	Web
Compress to a percentage or an exact target file size Batch processing of many images	Side-by-side comparison makes it easy to judge quality versus file size trade-offs Runs entirely in the browser with no upload needed
Some features are reserved for the paid premium tier Closed source	Focused narrowly on compression and format conversion, not general image editing Best suited to single images rather than batch processing
Downloadable app	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it 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.