What is XnView?
XnView MP/Classic enables you to open and edit your photo files conveniently on Windows, Linux and macOS. A wide range of image formats is supported by this tool (JPEG, TIFF, PNG, GIF, WEBP, PSD, JPEG2000, OpenEXR, camera RAW, HEIC, PDF, DNG, CR2). As an Image Viewer, you can adjust the color, resize, crop, take screen captures, and edit metadata (IPTC, XMP). A user-friendly interface allows you to view photos and images as well as manage them with XnView MP. The software also provides the ability to create contact sheets, slideshows, duplicate image finders, batch converters, and batch converters.
XnView JXL support
XnView MP 0.97.0 was released on the 24th of September 2020. Since then, you can easily view AVIF files within XnView like any other format.