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pngquant vs Squoosh: catalog facts
pngquant	Squoosh
Free Free and open source; the CLI is under GPL-3.0-or-later with some parts under HPND and…	Free Free to use.
Windows, macOS, Linux, Command line	Web
Large file size reductions with preserved transparency Adaptive dithering with less noise	Side-by-side comparison makes it easy to judge quality versus file size trade-offs Runs entirely in the browser with no upload needed
Command line only; graphical use needs a separate front end Lossy, so not suited to images that must stay pixel-exact	Focused narrowly on compression and format conversion, not general image editing Best suited to single images rather than batch processing
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	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 22, 2026

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