JPG and JPEG are identical file formats. No difference between a .jpg photo and a .jpeg file — both formats employ exactly the same JPEG encoding method and encode image data in the identical manner.
The difference is purely in the extension, as it is a historical artifact from early computer history. JPEG was introduced in 1992 by the Joint Photographic Experts Group. When Microsoft launched Windows in the early era, the OS enforced a constraint: extensions could only be three characters long.
This forced the four-character .jpeg extension to be abbreviated to .jpg for PC users. Non-Windows systems, not having the extension limitation, continued using the longer .jpeg file extension from the outset.
Even though both file types perform equally in nearly all today's programs, some cases in which a system might need the .jpeg extension. In these cases, changing the extension from .jpg to .jpeg is enough.
No image file conversion is needed — just renaming the extension resolves the problem usually.
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