Stayput

Convert JFIF to PNG

A lossless PNG copy of every .jfif picture, made on your device.

Nothing is uploaded Works offline Open source No limits, no watermark
Drop JFIF 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.

    A .jfif file is an ordinary JPEG with an unusual extension, typically a picture saved from the web on Windows. PNG is the right destination when the image is going into a design tool, a slide deck or an edit you will save several times: PNG is lossless, so every later save keeps exactly the pixels you have now instead of adding another round of JPEG artefacts.

    Your browser decodes each .jfif file inside this tab and writes a PNG. Expect the PNG to be several times larger than the JFIF, because PNG stores every pixel without loss. A PNG made from a JPEG has no transparency to begin with; converting does not add any.

    How it works

    1. Drop your JFIF 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

    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; HEIC goes 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 you like, 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

    Will the PNG look better than the JFIF?

    No. Converting cannot bring back detail the JPEG compression already removed. What PNG gives you is a copy that loses nothing more when you edit and save it again.

    Why is the PNG so much bigger?

    JPEG, and so JFIF, discards detail to stay small. PNG keeps every pixel. A 300 KB photo commonly becomes a 2 to 4 MB PNG. If size matters, convert to JPG instead.

    Can I convert many at once?

    Yes. Drop as many files as you like; download them one by one or as a single zip.

    Are the images uploaded?

    No. Decoding and encoding happen in your browser tab and the files never leave your device.

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