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Squooshpngquant
Free

Free to use.

 Free

Free and open source; the CLI is under GPL-3.0-or-later with some parts under HPND and…

Web Windows, macOS, Linux, Command line
  • Side-by-side comparison makes it easy to judge quality versus file size trade-offs
  • Runs entirely in the browser with no upload needed
  • Large file size reductions with preserved transparency
  • Adaptive dithering with less noise
  • Focused narrowly on compression and format conversion, not general image editing
  • Best suited to single images rather than batch processing
  • Command line only; graphical use needs a separate front end
  • Lossy, so not suited to images that must stay pixel-exact
Web application Downloadable app
Closed source Open source
License not stated License: GPL-3.0-or-later
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked September 22, 2026

Checked October 1, 2026

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