Stayput

Convert JXL to PNG

Open JPEG XL files anywhere by turning them into lossless PNGs, decoded on your device.

Nothing is uploaded Works offline Open source No limits, no watermark
Drop JXL files hereor click to choose files. Batches welcome.
    Working…

    Done

    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.

    How it works

    1. Drop your JXL files onto the page, or tap to pick them. Batches are fine.
    2. There are no quality settings: PNG is lossless, so the output matches the decoded image exactly.
    3. Download each PNG, 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

    Why is the decoder downloaded but my image is not uploaded?

    The download is the decoding program, the same for everyone, fetched from a public CDN. 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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