If you have ever saved an picture from the web and noticed it downloaded with a .jfif file extension in place of the expected .jpg, this happens often. JFIF — which stands for JPEG File Interchange Format — is a specification which defines how JPEG image data is saved.
Essentially, a JFIF file is a JPEG file. The .jfif file type occurs primarily when saving photos from specific browsers, particularly if the image is delivered with no a proper content-type header.
The .jfif extension appeared to regular users as some older browsers — mainly previous versions of Microsoft Edge — save JPEG images with the technically accurate .jfif extension when the server does not specify the filename.
The solution is easy: simply rename the file extension from .jfif to .jpg, or use a converter tool to produce a properly labelled JPG file. In each case, the photo content stays the same.
The quickest fix is a file extension change. For Windows users, turn on showing file extensions in File Explorer, right-click the .jfif file, choose Rename and update what is jfif file the extension to .jpg.
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