Compare software

Image Optimizer vs Klia Kompress: catalog facts
Image Optimizer	Klia Kompress
Free Free and open source under the MIT licence.	Free No price is mentioned; the app is published on Flathub under a proprietary EULA.
Linux	Linux
Lossless compression with identical pixels Processes a whole folder at once	Processes files locally without uploading Batch conversion with quality control
Only PNG and JPEG Overwrites the original files in place	Proprietary, source not published Very new project with little history
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License: Proprietary EULA
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.