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pngquant vs Curtail: catalog facts
pngquant	Curtail
Free Free and open source; the CLI is under GPL-3.0-or-later with some parts under HPND and…	Free Free and open source under the GPL-3.0-or-later.
Windows, macOS, Linux, Command line	Linux
Large file size reductions with preserved transparency Adaptive dithering with less noise	Handles PNG, JPEG, WebP and SVG Uses proven tools like oxipng and pngquant
Command line only; graphical use needs a separate front end Lossy, so not suited to images that must stay pixel-exact	Linux only Compression only, no other editing
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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