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OptiImagepngquant
Free

Free and open source under the LGPL-2.1-only licence.

 Free

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

Linux Windows, macOS, Linux, Command line
  • Lossless and lossy compression modes
  • Option to keep or remove metadata
  • Large file size reductions with preserved transparency
  • Adaptive dithering with less noise
  • Linux only
  • Young project, first released in late 2024
  • Command line only; graphical use needs a separate front end
  • Lossy, so not suited to images that must stay pixel-exact
Downloadable app Downloadable app
Open source Open source
License: LGPL-2.1-only License: GPL-3.0-or-later
No account needed No account needed
Works offline Works offline

Checked October 1, 2026

Checked October 1, 2026

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