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ImageMagickCastle Image Viewer
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, Linux, Command line
  • Over 200 formats, with conversion, resizing, compositing and effects from one command
  • APIs for most programming languages as well as the command line
  • Reads texture formats like KTX and DDS that many viewers cannot
  • Alpha bleeding for textures with transparency
  • 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
  • Editing is limited to a few specialised functions
  • Interface is aimed at game developers rather than photographers
Downloadable app Downloadable app
Open source Open source
License: ImageMagick License: GPL-2.0-or-later
No account needed No account needed
Works offline Works offline

Checked September 21, 2026

Checked October 2, 2026

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