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Caesium Image CompressorFastStone Photo Resizer
Free

Free and open source under the GPL.

 Free

Free for personal and educational use.

Windows, macOS, Web Windows
  • Batch processing with visible before and after sizes for the whole folder
  • Resize at the same time as compressing, in one pass
  • Batch conversion and renaming in one tool
  • Reads HEIC and WebP
  • 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
  • Windows only
  • Free licence covers personal and educational use only
Downloadable app, Web application Downloadable app
Open source Closed source
License: GPL-3.0 License not stated
No account needed No account needed
Works offline Works offline

Checked September 21, 2026

Checked October 2, 2026

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