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Caesium Image Compressor vs ImageMagick: catalog facts
Caesium Image Compressor	ImageMagick
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, Web	Windows, macOS, Linux, Command line
Batch processing with visible before and after sizes for the whole folder Resize at the same time as compressing, in one pass	Over 200 formats, with conversion, resizing, compositing and effects from one command APIs for most programming languages as well as the command line
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	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, Web application	Downloadable app
Open source	Open source
License: GPL-3.0	License: ImageMagick
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 21, 2026

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