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ImageMagickCaesium Image Compressor
Free

Free and open source under the ImageMagick licence, an Apache 2.0 style licence.

 Free

Free and open source under the GPL.

Windows, macOS, Linux, Command line Windows, macOS, Web
  • Over 200 formats, with conversion, resizing, compositing and effects from one command
  • APIs for most programming languages as well as the command line
  • Batch processing with visible before and after sizes for the whole folder
  • Resize at the same time as compressing, in one pass
  • The project advises creating and validating a security policy before use, especially with untrusted files
  • Its format handling has been a repeated source of security vulnerabilities
  • 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: ImageMagick License: GPL-3.0
No account needed No account needed
Works offline Works offline

Checked September 21, 2026

Checked September 21, 2026

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