How to Open JPEG XL Images on Linux

Go to the JPEG XL’s GitHub releases

Download the packages for your distribution. I use Linux Mint, so I’ll choose the latest Ubuntu.

Move the file to a separate folder and extract.

Open the terminal in the current folder.

Install the packages with this command.

sudo dpkg -i *deb

Open any JXL file.

Assign Image Viewer as the default application.

You can now open JXL images.

Alternatively, you can install gThumb image viewer. However, JPEG XL support is included only in the Flathub version.

Linux Mint has Flatpak built in. Other distributions probably don’t, here is how to install it.

If Flatpak isn’t your thing, you’ll have to build a plugin for gdk-pixbuf2 yourself. This enables JPEG XL support in most image viewers.