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Caesium Image CompressorImageOptim
Free

Free and open source under the GPL.

 Free

Free and open source under the GPL.

Windows, macOS, Web macOS
  • Batch processing with visible before and after sizes for the whole folder
  • Resize at the same time as compressing, in one pass
  • Runs several optimisers and keeps whichever result is smallest
  • Removes GPS and EXIF data as part of optimising
  • 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
  • macOS only
  • Optimisation is in place, so originals should be kept separately
Downloadable app, Web application Downloadable app
Open source Open source
License: GPL-3.0 License: GPL-2.0
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.