Eagle now supports JPEG XL (.jxl) image format. If you cannot preview JXL files properly in the software, simply install the "JXL Format Extension" plugin to resolve this issue.

Installing the JXL Format Extension Plugin

In Eagle software, click "Plugin" → "Plugin Center"
Enter "JXL" in the search box, or find "JXL Format Extension" in the "Format" category, then download and install the plugin.

Refreshing Thumbnails

After the plugin is installed, newly imported JXL files will automatically generate thumbnails.
If you already have JXL files in your library, you need to manually refresh thumbnails to display previews:

Select the JXL images that cannot be previewed
Right-click and select "More" → "Refresh Thumbnail"

Notes

After plugin installation, newly imported JXL files will automatically generate thumbnails
Existing files require manual thumbnail refresh to display previews
This plugin only supports JPEG XL (.jxl) format images

Unable to preview JPEG XL(.jxl) files