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

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