JPG and JPEG are the same photo formats. No distinction between a .jpg photo and a .jpeg photo — both apply the identical JPEG encoding method and save 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. The Windows operating system launched Windows in the early era, the operating system enforced a constraint: file extensions could only be three characters long.
Which forced the 4-character .jpeg extension to be reduced to .jpg for Windows computers. Apple and Unix platforms, which never had the extension limitation, used the full .jpeg file extension from the start.
While both file types function the same in virtually all today's programs, some scenarios 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 updating the file extension resolves the issue almost always.
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