JPG and JPEG are the same photo formats. No distinction between a .jpg photo and a .jpeg photo — both employ the identical JPEG encoding method and encode photos in the identical manner.
The only difference is entirely in the file extension, which is a historical artifact from early computing. JPEG was introduced in 1992 by the Joint Photographic Experts Group. Early Windows launched Windows in the early era, the system enforced a restriction: file extensions had more info to be no more than 3 characters.
Causing the four-character .jpeg suffix to be abbreviated to .jpg for Windows users. Mac and Unix systems, not having this three-character restriction, continued using the complete .jpeg extension from the start.
While both file types function the same in virtually all today's programs, some situations in which a platform requires the .jpeg extension. When this happens, renaming the file from .jpg to .jpeg is all that is needed.
No real conversion of image data is necessary — simply changing the file extension fixes the issue usually.
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