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pngquant vs pngcrush: catalog facts
pngquant	pngcrush
Free Free and open source; the CLI is under GPL-3.0-or-later with some parts under HPND and…	Free Free to use, modify, and redistribute under the license described with its source.
Windows, macOS, Linux, Command line	Windows, Linux, Command line
Large file size reductions with preserved transparency Adaptive dithering with less noise	Tries compression levels and PNG filters to reduce file size Can remove or add ancillary PNG chunks
Command line only; graphical use needs a separate front end Lossy, so not suited to images that must stay pixel-exact	It is a command-line application.
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: libpng license equivalent
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 8, 2026

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