Convert JXL to PNG
Open JPEG XL files anywhere by turning them into lossless PNGs, decoded on your device.
- Nothing is uploaded
- Works offline after first visit
- Open source
- No watermark · limit is your device’s memory; phones hold less
Convert JPEG XL (.jxl) images to PNG in your browser. It is free, needs no account and adds no watermark, and your files are not uploaded: everything runs in your browser on your device. The size limit is your device’s memory, and phones hold less; give the page a short while after one visit to save itself for offline use, and then it works offline.
Done
Free, no ads. Support StayPut
Open the network tab. Your files never appear in it.
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 (.jxl) is the successor to JPEG designed by the JPEG committee: smaller files, lossless mode, HDR, and a way to recompress old JPEGs without loss. Safari supports it, but Chrome and Firefox do not, and neither do most image editors yet, so a .jxl file you were sent or downloaded is often stuck. PNG is the safe destination: lossless, and opened by everything.
Because most browsers cannot decode JXL, this page loads the reference decoder (libjxl) compiled to WebAssembly by the Squoosh project. The decoder is about 850 KB, fetched once as a program file and cached. Your image is decoded to pixels in memory and the browser writes the PNG. If you are in Safari, its native decoder is used and nothing extra is downloaded.
Have another type of picture? Convert any image to PNG takes PNG, WebP, HEIC, GIF, BMP, AVIF and more.
How it works
- Drop your JXL files onto the page, or tap to pick them. Batches are fine.
- There are no quality settings: PNG is lossless, so the output matches the decoded image exactly.
- Download each PNG, or all of them as one zip.
In your browser, not on a server
Stayput first reads the opening bytes of each file, where every image format writes its signature, so it knows what the file really is whatever it is called. Your browser decodes JPG, PNG, WebP, GIF, BMP, AVIF and SVG itself; TIFF goes through UTIF.js, HEIC through the libheif WebAssembly decoder, and JPEG XL (or AVIF, in a browser without native support) through the Squoosh decoders, all served from this site and cached. The browser re-encodes JPG, PNG and WebP; PDF, ICO, GIF, BMP and TIFF files are written by small encoders in the page. Nothing here needs a server.
Compared with upload-based tools: Online converters upload your image, convert it on their machine, keep it for hours and cap you at a few files a day. This does the same conversion on your device, for as many files as your device’s memory can hold, with no upload to wait for.
Verify it yourself. Give the page a short while after one visit to save itself for offline use, then turn off Wi-Fi or switch to airplane mode and run the tool again. 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
Why is the decoder downloaded but my image is not uploaded?
The download is the decoding program, the same for everyone, served from this site. Your image never leaves your device: it is read from disk into memory, decoded by that program inside your tab, and saved back to disk. The network panel on this page counts the requests so you can check.
Will the PNG be larger than the JXL?
Almost always, often many times larger. JXL is a highly efficient format and PNG stores every pixel. If you need a small file, convert to JPG or WebP instead.
Does it keep HDR or animation?
No. The output is a standard 8-bit PNG of the first frame. HDR content is tone-mapped by the decoder to standard range.
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Guides
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