Compare software

Klia Kompress vs Image Optimizer: catalog facts
Klia Kompress	Image Optimizer
Free No price is mentioned; the app is published on Flathub under a proprietary EULA.	Free Free and open source under the MIT licence.
Linux	Linux
Processes files locally without uploading Batch conversion with quality control	Lossless compression with identical pixels Processes a whole folder at once
Proprietary, source not published Very new project with little history	Only PNG and JPEG Overwrites the original files in place
Downloadable app	Downloadable app
Closed source	Open source
License: Proprietary EULA	License: MIT
No account needed	No account 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 1, 2026

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