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OptiPNG vs Rimage: catalog facts
OptiPNG	Rimage
Free Free and open source under the zlib licence.	Free Free and open source, dual-licensed under Apache 2.0 and MIT.
Windows, Command line	Windows, Command line
Lossless recompression of PNG files Converts BMP, GIF, PNM and TIFF to optimized PNG	Modern codecs for small output files Scriptable from the command line
Command line only, no graphical interface Lossless only, so savings are smaller than lossy tools	No graphical interface No tagged releases on GitHub
Downloadable app	Downloadable app
Open source	Open source
License: Zlib	License: Apache-2.0 OR MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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