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OptiPNG vs OptiImage: catalog facts
OptiPNG	OptiImage
Free Free and open source under the zlib licence.	Free Free and open source under the LGPL-2.1-only licence.
Windows, Command line	Linux
Lossless recompression of PNG files Converts BMP, GIF, PNM and TIFF to optimized PNG	Lossless and lossy compression modes Option to keep or remove metadata
Command line only, no graphical interface Lossless only, so savings are smaller than lossy tools	Linux only Young project, first released in late 2024
Downloadable app	Downloadable app
Open source	Open source
License: Zlib	License: LGPL-2.1-only
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 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.