Convert JPEG XL to ICO
Turn your JPEG XL into an ICO. JPEG XL gets photos smaller than JPG with no visible difference, and it can shrink a JPG you already have without losing anything at all. The practical difference is that the result opens anywhere, which JPEG XL files do not. Your file never leaves your computer.
Need the other direction? Convert ICO to JPEG XL
How to convert JPEG XL to ICO
- 1 Drop your JPEG XL .jxl file onto the page, or click to browse for it.
- 2 Set the quality, or leave the default, which keeps the file small without anything showing.
- 3 Convert. The work happens on your own machine, so how long it takes depends on your computer and the file.
- 4 Download the ICO, or add more files and do the whole set in one go.
Why convert JPEG XL to ICO
- A JPEG XL will not open in a browser, so anything going onto a web page, into a document or into a message has to become an ICO first.
- Holds several resolutions so the system never has to rescale.
- Still the most reliably recognised favicon format.
- favicon.ico at the root of a website.
- JPEG XL: browser support is still inconsistent and politically contested.
JPEG XL compared with ICO
How the two formats differ on the things that decide whether a conversion is worth making.
| Property | JPEG XL | ICO |
|---|---|---|
| File extension | .jxl | .ico |
| Animation | Yes | No |
| Multiple pages | No | Yes |
| Colour depth | Up to 32 bits per channel, HDR | Up to 32-bit with alpha |
| Browser support | Some browsers | Every browser |
| Introduced | 2021 | 1985 |
| Developed by | JPEG Committee | Microsoft |
| Standard | Open | Proprietary |
Quality and what changes
ICO stores the same content under a different set of rules, so what matters here is compatibility rather than picture quality. Convert once from the best source you have rather than through a chain of intermediate files.
- Only the first frame of an animated JPEG XL is kept.
- Each ICO entry is capped at 256 by 256 pixels.
- One ICO limitation to keep in mind: each picture inside it is capped at a small size.
Questions about JPEG XL to ICO
What happens to an animated JPEG XL?
ICO holds a single image, so only one frame survives, normally the first. If you need the motion, convert to a format that keeps it such as MP4, WebM or WebP rather than to ICO.
Is there a maximum size for ICO?
Yes, ICO is limited to 256 x 256 pixels per entry. Images beyond that have to be scaled down or split before they can be written, which is a property of the format rather than of this tool.
Is my JPEG XL file uploaded anywhere?
No. The whole thing runs inside the browser tab you already have open. Your JPEG XL is read straight from your own disk, converted on your machine and handed back as an ICO. Nothing is sent anywhere, nothing is stored and there is no account.
Is there a file size limit?
There is no server-side limit because no server sees the file. The real ceiling is your device memory, since the input and the output both have to fit in the tab. A few hundred megabytes is usually fine on a desktop machine and considerably less on a phone.
Can I convert several JPEG XL files at once?
Yes. Add as many as you like and they are processed one after another, then offered as separate ICO downloads or as a single ZIP. Speed depends on your own processor rather than on a queue.
Does the converter work offline?
Yes, after the page has loaded once. The engine is cached by the browser, so you can disconnect, reload and keep converting. That falls out of doing the work locally rather than being a separate mode you switch on.