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Caesium Image Compressor vs TinyPNG: catalog facts
Caesium Image Compressor	TinyPNG
Free Free and open source under the GPL.	Freemium The online compressor is free; the developer API and image CDN have paid plans.
Windows, macOS, Web	Web
Batch processing with visible before and after sizes for the whole folder Resize at the same time as compressing, in one pass	Nothing to install, works in the browser Handles AVIF, JXL, WebP, PNG and JPEG
No official Linux binary; you compile it or use a third-party build Windows 10 build 1809 or later and macOS 12 or later, 64-bit only	Lossy compression changes image data Requires an internet connection and uploading images
Downloadable app, Web application	Web application
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Needs internet
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 2, 2026

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