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FastStone Photo ResizerCaesium Image Compressor
Free

Free for personal and educational use.

 Free

Free and open source under the GPL.

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

Checked October 2, 2026

Checked September 21, 2026

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