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Convert JPG to PNG

Convert JPG photos to lossless PNG free, with no signup and no watermark. Useful when a tool refuses JPEG or you need to edit without further loss.

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Results appear here. Nothing is uploaded.

    How it works

    The JPEG is decoded by the browser's own createImageBitmap into raw pixels, drawn onto an OffscreenCanvas inside a Web Worker, and written back out as PNG. PNG is a lossless container, so what you get is an exact copy of the pixels the JPEG decoder produced. It is important to be clear that this does not undo the original JPEG compression — the artefacts baked in when the photo was first saved are now stored losslessly. No wasm is downloaded.

    Measured results

    These figures come from running this exact tool over a fixed set of sample files on every build, not from an estimate.

    Sample fileSettingsBeforeAfterChange
    photo-gradient.jpglossless504 KB3.27 MB+563%

    Benchmark run 2026-08-02.

    What to watch out for

    The file will get considerably larger

    This is expected, not a bug. PNG stores every pixel exactly, so a 2 MB photograph commonly becomes 8 to 15 MB. If your goal was a smaller file, PNG is the wrong target format entirely.

    Existing JPEG artefacts are preserved forever

    Converting to PNG cannot recover detail that JPEG already discarded. The blocking and ringing around edges is now part of the image data and will be stored faithfully, byte for byte, from here on.

    EXIF metadata is stripped

    The canvas pipeline hands over pixels only, so camera model, GPS coordinates, capture date and orientation tags do not survive. That is a privacy win in most cases, but it does mean rotation baked only into an EXIF tag is applied and then discarded.

    Limits

    Files up to about 50 MB work reliably. Beyond that, the ceiling is your device's memory rather than any rule we impose — the work happens on your own machine. Tested in Chrome 140, Firefox 143, Safari 18.

    Why anyone converts JPG to PNG

    Going this direction never makes a file smaller, so the reason is always about what happens next. Three cases cover almost all of it.

    The first is a tool that simply refuses JPEG. Plenty of software — some print workflows, some game engines, a fair number of upload forms that want lossless input — accepts PNG only. The pixels are the same either way; the container is what is being objected to.

    The second is editing. Every time you save a JPEG, it is re-compressed and loses a little more. If you are about to make several rounds of edits, converting to PNG first means the intermediate saves cost you nothing further. The damage from the original compression stays, but no new damage accumulates.

    The third is stripping metadata. Because the conversion goes through raw pixels, GPS coordinates and camera details in the JPEG’s EXIF block are left behind.

    What this cannot do

    It is worth being direct, because a lot of converter sites are not. Converting to PNG does not improve image quality and does not repair a compressed photo. JPEG compression is one-way: the discarded high-frequency detail is gone, and no format change brings it back. What you get is a lossless recording of an already lossy image.

    If your actual problem is that a photo looks bad, the fix is to find the original file, not to convert this one.

    Local processing, and why it matters here

    PNG output of a large photograph is big — often eight times the input. On an upload-based converter you pay for that twice, once sending the photo up and once pulling the much larger result back down. Here the file is produced in a Web Worker on your own machine and handed straight to your downloads folder, so the size of the output costs you nothing but disk space.

    Your files never leave your browser. Last updated 2026-07-31.