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MozJPEG vs jpegoptim: catalog facts
MozJPEG	jpegoptim
Free Free and open source under BSD-style, IJG and zlib licences.	Free Free and open source under the GPL-3.0 licence.
Windows, Command line	Windows, Linux, Command line
Smaller JPEG files that work in any JPEG decoder Includes cjpeg and djpeg command-line tools	Small, fast tool focused on one job Easy to use in scripts and batch jobs
Command-line only, with no graphical interface Encoding is slower than a standard encoder	Handles JPEG files only No graphical interface
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause AND IJG AND Zlib	License: GPL-3.0
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.