Convert JXL to JPG
Turn JPEG XL files into ordinary JPGs that open in every app, without sending them anywhere.
Done
Open the network tab. It stays empty.
Add files and run the tool to see every request this tab makes.
Your files are processed on this device and never sent to a server. Reload the page to clear everything from memory.
JPEG XL promises to replace JPEG one day, but today a .jxl file will not open in Chrome, Firefox, Windows Photos or most editors. Converting to JPG gives you a file that works everywhere, at a size close to the original.
The decoding happens in this tab with libjxl compiled to WebAssembly (Safari uses its built-in decoder). The pixels are then encoded as JPG by your browser at the quality you pick. Transparent areas, which JPG cannot store, are filled with the background colour you choose.
How it works
- Drop your JXL files onto the page, or tap to pick them. Batches are fine.
- Adjust the quality slider if you want a smaller file, or leave it at 90.
- Download each JPG, or all of them as one zip.
In your browser, not on a server
Your browser already knows how to decode JPG, PNG, WebP, AVIF and SVG. Stayput draws each image onto an off-screen canvas and asks the browser to encode it again in the format you picked. HEIC input goes through the libheif WebAssembly decoder, and JPEG XL (or AVIF, in a browser without native support) through the Squoosh decoders compiled to WebAssembly, fetched once as program files and cached. Nothing here needs a server because nothing here is beyond what a browser can do on its own.
Compared with upload-based tools: Online converters upload your image, convert it on their machine and hand it back through an ad-covered download page. This does the same conversion with the same codecs, on your device, in less time than the upload.
Verify it yourself. Load this page, turn off Wi-Fi or switch to airplane mode, and run the tool. Or open your browser's developer tools (F12, or Cmd-Option-I on a Mac), pick the Network tab, and watch it while you convert. The panel above does the same count for you.
Questions
Is the conversion lossless?
No. JPG is lossy, so a little detail is discarded when the pixels are re-encoded. At quality 90 the difference is invisible for photos. Use the JXL to PNG page for a lossless copy.
Are my files uploaded?
No. The decoder is a program file fetched once from a CDN and cached; your images are decoded and re-encoded inside your browser tab and never travel anywhere.
Can I convert many files at once?
Yes. Drop a folder’s worth of .jxl files and download them one by one or as a single zip.
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