Convert AVIF to JPEG XL
This makes a JPEG XL out of the AVIF you already have. 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. Worth knowing: a JPEG XL will not open in a browser tab, so it is a file for software rather than for the web. Your file never leaves your computer.
Need the other direction? Convert JPEG XL to AVIF
How to convert AVIF to JPEG XL
- 1 Drop your AVIF .avif 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 JPEG XL, or add more files and do the whole set in one go.
Why convert AVIF to JPEG XL
- Excellent quality for the file size, whichever mode you use.
- Can recompress existing JPEGs losslessly and reverse the process.
- Losslessly shrinking an existing JPEG library.
- AVIF: encoding is computationally expensive compared to JPEG or WebP.
AVIF compared with JPEG XL
How the two formats differ on the things that decide whether a conversion is worth making.
| Property | AVIF | JPEG XL |
|---|---|---|
| File extension | .avif | .jxl |
| Colour depth | Up to 12 bits per channel, HDR and wide gamut | Up to 32 bits per channel, HDR |
| Browser support | All current browsers | Some browsers |
| Introduced | 2019 | 2021 |
| Developed by | Alliance for Open Media | JPEG Committee |
Quality and what changes
JPEG XL 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.
- Browsers will not display a JPEG XL, so it downloads rather than opening in a tab.
- One JPEG XL limitation to keep in mind: getting the best out of it takes more than one quality slider.
Questions about AVIF to JPEG XL
Is my AVIF file uploaded anywhere?
No. The whole thing runs inside the browser tab you already have open. Your AVIF is read straight from your own disk, converted on your machine and handed back as a JPEG XL. 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 AVIF files at once?
Yes. Add as many as you like and they are processed one after another, then offered as separate JPEG XL 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.