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JarkViewer vs XnView Classic: catalog facts
JarkViewer	XnView Classic
Free Free and open source.	Free Offered as free software by the developer.
Windows	Windows
Opens AVIF, HEIC and JPEG XL without extra codecs Handles animated images, RAW files and Live Photos	Opens a very large number of image formats, including RAW and DICOM Lossless JPEG rotation and crop
Windows only Viewer only, with no editing or library features	Classic edition is the older product; XnView MP is the cross-platform successor line Closed source
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
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.