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Castle Image ViewerImageMagick
Free

Free and open source under the GPL.

 Free

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

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

Checked October 2, 2026

Checked September 21, 2026

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