JFIF to JPG Converter
A .jfif file is a JPEG with an unusual name. This converter fixes the name in bulk: by default it copies each file's JPEG data unchanged and saves it with a .jpg extension, so there is no re-compression and no quality loss. Everything runs in your browser and the files never leave your device.
Drop .jfif files here
Or paste with Ctrl+V (Cmd+V on a Mac). Accepts PNG, JPG, JFIF, WebP, AVIF, HEIC, GIF and BMP. Nothing is uploaded.
How to convert JFIF to JPG
- Add your .jfif files. Drop them on the box or click Pick files; the picker lists .jfif files alongside other images.
- Leave Keep JPEG data unchanged ticked. That is the lossless option. Untick it only if you also want to re-compress the images to make them smaller, using the quality slider.
- Convert. Each file is checked first. If it really contains JPEG data it is copied as it is and marked Copied unchanged; anything else is decoded and re-encoded as a proper JPG.
- Download. Save each .jpg, or all of them as one ZIP.
JFIF and JPG compared
| Feature | JFIF | JPG |
|---|---|---|
| Transparency | No (it is JPEG) | No |
| Animation | No | No |
| Compression | Lossy (JPEG) | Lossy |
| Typical file size | Identical to the same image saved as .jpg | Small for photos; text and sharp edges compress badly |
| Support | Any JPEG decoder; some upload forms reject the extension | Universal |
| Best for | Nothing in particular: rename it to .jpg | Photos, email, upload forms |
What is a JFIF file?
JFIF stands for JPEG File Interchange Format, a 1992 specification for how JPEG-compressed data is packaged in a file. Most .jpg files you have ever opened follow it, or the closely related EXIF layout that cameras use. A .jfif file is the same thing under a different extension: same bytes, same quality, same compatibility for any program that looks at the data rather than the name.
Why do images save as .jfif?
It is almost always Windows. When Chrome or Edge saves an image, they ask Windows which extension belongs to the image/jpeg content type, and on some PCs the registry answers .jfif, often after other software changed it. The setting lives in the Extension value under HKEY_CLASSES_ROOT\MIME\Database\Content Type\image/jpeg; setting it to .jpg stops new downloads saving as .jfif. Only edit the registry if you are comfortable doing so, and back it up first.
Renaming versus converting
Renaming a .jfif file to .jpg in File Explorer gives exactly the same result as this tool's default setting. The tool is simply quicker for a batch, works when extensions are hidden, and checks that each file really is a JPEG before relabelling it.
Things worth knowing
- Copying keeps everything inside the file, including EXIF metadata such as camera details and, if present, GPS location. Untick Keep JPEG data unchanged to re-encode instead; re-encoding strips metadata.
- Re-encoding is lossy and only worth doing to shrink a large file.
- Browsers report a .jfif file's type inconsistently, sometimes as image/jpeg and sometimes as nothing, so the tool recognises it by extension and by checking the data itself.
Questions people ask
Are my images uploaded anywhere?
No. Your browser decodes and re-encodes each image on your own device, so there is no server to upload to and nothing is stored. The page does fetch extra code from this site the first time you use certain features (the ZIP download, PDF output, a WebP encoder for browsers without one, and the HEIC decoder), but your images are never part of those requests.
Is JFIF the same as JPG?
Yes, for every practical purpose. Both are JPEG-compressed images; JFIF is the name of the file layout most JPGs use. Only the extension differs.
Can I just rename .jfif to .jpg?
Yes. Change the extension and the file opens as a JPG everywhere. If Windows hides extensions, turn on File name extensions in File Explorer's View menu first, or drop the files here.
Does converting JFIF to JPG lose quality?
Not with the default setting, which copies the data byte for byte. Quality only changes if you untick Keep JPEG data unchanged and re-encode.
Why do websites reject my .jfif upload?
Upload forms often check the extension against a list such as .jpg, .jpeg and .png. The image itself would be fine; the name is what fails.
If something goes wrong
A file is marked re-encoded rather than copied
Its contents were not JPEG, for example a WebP saved with a .jfif name. The output is still a proper JPG, encoded at the quality shown.
New downloads keep saving as .jfif
Change the registry value described above, or rename in batches here. Restart the browser after changing the registry.
I want the metadata removed
Untick Keep JPEG data unchanged. The image is then re-encoded and nothing but the pixels is carried across.
Built by Dr. Dulan Dias. Last tested , converting real files end to end in the browser.
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