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XL Converter vs Klia Kompress: catalog facts
XL Converter	Klia Kompress
Free Free and open source under the GPLv3.	Free No price is mentioned; the app is published on Flathub under a proprietary EULA.
Windows, Linux	Linux
Supports JPEG XL, AVIF and JPEGLI encoding Lossless, reversible JPEG to JPEG XL transcoding	Processes files locally without uploading Batch conversion with quality control
macOS build is a deprecated beta Focused on conversion rather than editing	Proprietary, source not published Very new project with little history
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-only	License: Proprietary EULA
No account needed	No account needed
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.