Quire

Free image tool

Convert JPG to PNG in your browser

Some apps and upload forms want PNG files. This tool turns JPG images into PNG files on your device. Nothing is uploaded.

PNG is lossless, so the PNG holds exactly the pixels decoded from the JPG. It cannot bring back detail that the JPG compression already removed, and the file will be several times larger.

JPG to PNG

Your images are converted on this device and never uploaded.

JPG → PNG

Metadata such as the location, camera and date is not copied into the new file. Colors are converted to sRGB.

Drop files here, or

JPG files. Up to 100 at a time, 50 MB each.

    How it works

    1. Leave OxiPNG on to make the PNG files smaller without changing any pixels, or turn it off for faster conversion.

    2. Choose your JPG files, or drop them anywhere on the page. Conversion starts right away.

    3. Download each PNG, or all of them as one ZIP file.

    Your browser decodes each JPG in a background worker and writes it as a PNG. OxiPNG, compiled to WebAssembly, then recompresses the PNG without changing any pixels. On a 12-megapixel test photo, OxiPNG made the browser's PNG 28% smaller and took about 9 seconds. The image is not sent anywhere.

    Questions

    What it does and what it does not

    Privacy, metadata, file limits and browser support.

    Are my images uploaded?

    No. The page and its encoders load from quireapps.com, and after that each image is read, converted and saved inside your browser tab. There is no analytics or tracking on this page. You can check this in your browser's developer tools, on the Network tab: converting an image makes no requests.

    Does converting to PNG improve the quality?

    No. The PNG is an exact copy of the decoded JPG, including any blocky or smudged areas from the JPG compression. What PNG does give you is that the image will not lose any more quality when you edit and save it again.

    Why is the PNG so much larger?

    JPG throws away detail you are unlikely to see, and PNG keeps every pixel exactly. For photos that makes the PNG several times larger. OxiPNG brings the size down a little without any loss. If you need a small file, keep the JPG.

    Does the PNG have a transparent background?

    No. JPG files have no transparency, so the PNG is fully opaque. Making a background transparent means editing the image, which this tool does not do.

    What happens to the metadata?

    It is not copied. The new file has no EXIF location, camera details or date taken. The EXIF orientation is applied to the pixels first, so the image keeps the way it was displayed. Colors are converted to sRGB and no color profile is written. To remove metadata without converting, use the EXIF remover.

    Are there limits?

    Each file can be up to 50 MB and 100 megapixels, and the list holds up to 100 files at a time. Safari on iPhone and iPad limits images to about 16.7 megapixels for this kind of processing, so larger images can fail there. Files are converted one at a time.

    Which browsers does it work in?

    It is tested in Chrome. Current versions of Edge, Firefox and Safari should also work, but they have had less testing here.

    Is it free?

    Yes. There is no account, no sign-up, no watermark and no daily limit.