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Image Optimizer vs Curtail: catalog facts
Image Optimizer	Curtail
Free Free and open source under the MIT licence.	Free Free and open source under the GPL-3.0-or-later.
Linux	Linux
Lossless compression with identical pixels Processes a whole folder at once	Handles PNG, JPEG, WebP and SVG Uses proven tools like oxipng and pngquant
Only PNG and JPEG Overwrites the original files in place	Linux only Compression only, no other editing
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0-or-later
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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