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TinyPNG vs Image Optimizer: catalog facts
TinyPNG	Image Optimizer
Freemium The online compressor is free; the developer API and image CDN have paid plans.	Free Free and open source under the MIT licence.
Web	Linux
Nothing to install, works in the browser Handles AVIF, JXL, WebP, PNG and JPEG	Lossless compression with identical pixels Processes a whole folder at once
Lossy compression changes image data Requires an internet connection and uploading images	Only PNG and JPEG Overwrites the original files in place
Web application	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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