JPG and JPEG are the same photo formats. No technical difference between a .jpg file and a .jpeg file — they both employ the very same JPEG compression algorithm and encode pictures in the exact same format.
The sole distinction is entirely in the extension, being a historical artifact from early computer history. The JPEG format was developed in 1992 by the Joint Photographic Experts Group. The Windows operating system released early versions of Windows, the OS had a constraint: extensions were limited to be three characters long.
Which forced the 4-character .jpeg extension to be shortened to .jpg for Windows computers. Non-Windows systems, without this 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 needed — jpg vs jpeg format simply changing the file extension fixes the issue usually.
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