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ImageOptimCaesium Image Compressor
Free

Free and open source under the GPL.

 Free

Free and open source under the GPL.

macOS Windows, macOS, Web
  • Runs several optimisers and keeps whichever result is smallest
  • Removes GPS and EXIF data as part of optimising
  • Batch processing with visible before and after sizes for the whole folder
  • Resize at the same time as compressing, in one pass
  • macOS only
  • Optimisation is in place, so originals should be kept separately
  • 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
Open source Open source
License: GPL-2.0 License: GPL-3.0
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked September 22, 2026

Checked September 21, 2026

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