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Curtail vs TinyPNG: catalog facts
Curtail	TinyPNG
Free Free and open source under the GPL-3.0-or-later.	Freemium The online compressor is free; the developer API and image CDN have paid plans.
Linux	Web
Handles PNG, JPEG, WebP and SVG Uses proven tools like oxipng and pngquant	Nothing to install, works in the browser Handles AVIF, JXL, WebP, PNG and JPEG
Linux only Compression only, no other editing	Lossy compression changes image data Requires an internet connection and uploading images
Downloadable app	Web application
Open source	Closed source
License: GPL-3.0-or-later	License not stated
No account needed	Not stated if an account is needed
Works offline	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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