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Pngyu vs OptiPNG: catalog facts
Pngyu	OptiPNG
Free Free and distributed under the BSD license.	Free Free and open source under the zlib licence.
Windows, macOS	Windows, Command line
Gives pngquant a graphical interface Pre-built binaries for Windows and macOS	Lossless recompression of PNG files Converts BMP, GIF, PNM and TIFF to optimized PNG
Handles PNG files only No pre-built Linux binary	Command line only, no graphical interface Lossless only, so savings are smaller than lossy tools
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause	License: Zlib
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

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