Stayput

Convert JFIF to JPG

Fix the pictures Windows saved as .jfif so every app and upload form accepts them.

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 a JPEG. JFIF (JPEG File Interchange Format) is the name of the wrapper almost every JPEG has used since 1992, and Windows labels some downloaded images with that extension instead of .jpg, usually pictures saved from Chrome or Edge. The picture is fine; the problem is that upload forms, older editors and some phones look at the extension and refuse the file.

    This page reads each .jfif file, decodes it in your browser and writes it back out as a standard .jpg. Drop a whole folder of them and download a zip. If you only have one file on a computer, renaming it from .jfif to .jpg also works, because the bytes inside are already JPEG; the converter is for batches, for phones where renaming is awkward, and for files that are not quite what their extension says.

    How it works

    1. Drop your JFIF files onto the page, or tap to pick them. Batches are fine.
    2. Adjust the quality slider if you want a smaller file, or leave it at 90.
    3. Download each JPG, 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

    Is JFIF the same as JPG?

    Yes, in practice. JFIF is the standard container for JPEG data, and .jfif, .jpg, .jpeg and .jpe files are all the same kind of image. Only the name at the end differs, and some software checks the name.

    Why do my downloaded images save as .jfif?

    Windows maps the image/jpeg type to the .jfif extension in its registry on some machines, so browsers on those machines offer .jfif when you save a picture. Converting the files, or renaming them, fixes it for the files you already have.

    Does converting lose quality?

    The image is re-encoded as JPG at the quality you choose, 90 by default, which is visually identical for photos. If you want the original bytes untouched, rename the file instead of converting it. Tick "Keep EXIF metadata" to carry the camera data over.

    Are the images uploaded?

    No. Your browser decodes and encodes each image inside this tab. There is no server in the process; you can go offline after the page loads.

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