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Caesium Image Compressoroxipng
Free

Free and open source under the GPL.

 Free

The open-source software is available without a license fee. Hosting, hardware and…

Windows, macOS, Web Windows, macOS, Linux, Command line
  • Batch processing with visible before and after sizes for the whole folder
  • Resize at the same time as compressing, in one pass
  • Uses parallel processing and supports animated PNG files.
  • No official Linux binary; you compile it or use a third-party build
  • Windows 10 build 1809 or later and macOS 12 or later, 64-bit only
  • It targets PNG formats rather than general image conversion.
Downloadable app, Web application Downloadable app
Open source Open source
License: GPL-3.0 License: MIT
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 21, 2026

Checked September 22, 2026

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