Many users have downloaded an photo from the internet and discovered it appeared with a .jfif file extension rather than the usual .jpg, this is common. JFIF — short for JPEG File Interchange Format — is a specification defining how JPEG photos is encoded.
Essentially, a JFIF file is a JPEG photo. The .jfif file type shows up mainly after saving images from certain browsers, mainly if the image was served with no a proper file type header.
This file extension started showing to most people as some web browsers — particularly previous versions of Internet Explorer — store JPEG images with the proper .jfif file extension when the server omits the download name.
Fixing this is straightforward: simply rename the file extension from .jfif to .jpg, or process it with a conversion tool to produce a correctly named JPG file. In each case, the picture quality does not change.
The quickest fix is a simple rename. On Windows, turn on showing file extensions in File Explorer, click the .jfif file, choose Rename and update the file extension to .jpg.
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