JXL to ICO Converter - Convert JPEG XL to Icons Online Free

How to convert JXL to ICO

Add your JXL files. Drop up to 30 JPEG XL files into the box, or browse for them. They are decoded on your device and never uploaded.
Crop it square. Not square? Pick Crop to square under Fit, or the Round app icon preset for a circle.
Pick the icon sizes. Recommended packs 16 to 256 px into one ICO. Favicon and Windows app are one click away.
Make the ICO and download. Press Make my ICO. One or two icons download directly, more come as a ZIP.

Want to look at the JPEG XL first? Open it in the JXL Image Viewer.

Why turn a JPEG XL into an ICO?

Windows cannot use a JPEG XL file as an icon, and most apps cannot open it yet.

An ICO packs your image at every icon size, ready for a folder, a shortcut or a website favicon.

How the JPEG XL is decoded

Safari 17+ reads JPEG XL itself, so it is instant there.

In Chrome, Edge and Firefox the page loads libjxl, compiled to WebAssembly, the first time you add a file. Your image still never leaves your device.

Animated JXL files show every frame under the preview - tick the frame you want, or several for one icon each.

Which icon sizes do you need?

Size	Where it shows up	Preset
16 x 16	Browser tabs, Explorer details view, title bars	All presets
32 x 32	Desktop at 100%, taskbar, bookmarks	All presets
48 x 48	Explorer medium icons, Windows site tiles	All presets
64 / 128	Large icons and high-DPI screens	Recommended
256 x 256	Extra large icons, Windows 10 and 11 Start	Recommended, Windows app

The How it looks small panel shows the 16 and 32 px sizes - crop in on the subject if it looks busy.

Tips for great icons

Crop tight. One object reads far better at 32 px than a whole scene. The Image Cropper helps with exact crops.
Transparent JXL? The transparency is kept in every icon size.
Blurry at 16 px? Turn on Sharpen small sizes - it gives the 16 to 48 px layers a light sharpen.
Mac too? Turn on Mac ICNS too under Extra files. For more Mac options use PNG to ICNS.
Just need a normal picture? JXL to PNG or JXL to JPG open everywhere.
Need test files? Try the JXL sample files.

Frequently Asked Questions

Drop your JXL file into the box, pick Crop to square if it is not square, and press Make my ICO.

The icon downloads right away, with every size packed inside one .ico file.

No. The JPEG XL is decoded and turned into an ICO in your browser, on your device.

Yes. They cannot open JPEG XL themselves, so the page loads its own decoder (libjxl in WebAssembly) the first time you add a file.

Yes. Transparent areas stay transparent in every icon size.

Yes. Turn on Mac ICNS too under Extra files - you get a .icns from 16 to 1024 px with the same crop and shape, next to the .ico.

Yes. Pick the Round app icon preset, or set Shape to Circle. Everything outside the circle becomes transparent.

Yes. Pick the Website pack preset - you get favicon.ico, PNG sizes, apple-touch-icon, a manifest and the HTML to paste.

Yes. Layers below 256 px are 32-bit bitmaps with a mask and the 256 px layer is a 32-bit PNG - the layout Windows Explorer expects.