JPEG and JPG are identical file formats. No technical difference between a .jpg image and a .jpeg photo — both formats apply the very same JPEG compression standard and encode image data in the identical manner.
The sole distinction is purely in the extension, being a historical artifact from early computer history. JPEG was developed in 1992 by the Joint Photographic Experts Group. Early Windows released early versions of Windows, the operating system had a limitation: file extensions could only be 3 characters.
Causing the four-character .jpeg extension to be shortened to .jpg for Windows users. Mac and Unix systems, which never had this character limit, used the full .jpeg extension from the beginning.
Even though both file types perform equally in nearly all today's programs, some cases where a service might need the .jpeg extension. In these cases, changing the extension from .jpg to .jpeg is enough.
No real conversion of image data is necessary — just renaming the extension jpg jpeg difference fixes the issue almost always.
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