JPG and JPEG are identical file formats. No distinction between a .jpg photo and a .jpeg photo — both formats apply the identical JPEG compression standard 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. Early Windows introduced Windows in the early era, the system enforced a restriction: file extensions could only be no more than 3 characters.
Causing the four-character .jpeg suffix to be reduced to .jpg for PC users. Mac and Unix systems, not having the character limit, could use the complete .jpeg extension from the outset.
Although both extensions perform equally in nearly all current applications, certain cases where a service might need the .jpeg file type. For these situations, changing the extension from .jpg to .jpeg is enough.
No actual file conversion is required — only renaming the extension solves the problem in most cases.
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