Converting JPEG XL to ICO gives you a larger file with identical content. It runs in your browser: nothing is uploaded, there is no queue and no size limit.
What changes when you convert JPEG XL to ICO
- ICO is lossless, but it cannot restore what JPEG XL already threw away. The file will be larger, often much larger, with exactly the same picture in it.
- ICO is a still format. An animated JPEG XL keeps only its first frame. For animation, convert to WebP, AVIF or MP4 instead.
- JPEG XL can carry HDR and 10-bit colour; ICO cannot. Highlights are tone-mapped to standard range.
- ICO does not carry metadata: EXIF, GPS, camera settings and tags are dropped. That is a privacy feature as often as it is a loss.
When to convert, and when not to
Convert to ICO for favicons and Windows app icons. Windows icon and favicon container, several sizes in one file.
Keep JPEG XL for archiving photos without quality loss. Can recompress a JPG losslessly and shrink it by ~20%. Excellent quality, limited browser support.
Do not convert to ICO hoping to improve quality: the detail JPEG XL discarded is gone. Convert only when a tool insists on ICO.
How to convert JPEG XL to ICO
- Drop your JPEG XL file on the converter above, or click to choose. Several at once is fine.
- Check the options if you need them: resize, width (px), height (px), with both set, scale (%), never enlarge beyond the original.
- Click Convert, then Download. Nothing was sent anywhere, your browser did the work.
Questions
Is my JPEG XL file uploaded?
No. The conversion runs in your browser with WebAssembly. There is no upload endpoint on this site. You can open your browser's Network tab, or go offline after the page loads, and it still works.
Is there a file size limit?
No fixed one. The limit is your device's memory: a large images file on a phone is slower than on a laptop, but nothing is rejected for being big.
Is it free?
Yes, without an account, without a daily cap and without a watermark. Your device does the computing, so there is no server bill to pass on.
Will the quality drop?
No. ICO is lossless: the images content is stored exactly.
Can I convert several files at once?
Yes. Drop them all; each is converted in turn and you can download them one by one or as a single ZIP.
Which engine does the conversion?
Image engine (jSquash: mozjpeg, oxipng, libwebp, libavif, libjxl), compiled to WebAssembly and running in your browser, on all your CPU cores when the browser allows it. First use downloads about 1.5 MB, cached afterwards.