These two formats are identical image formats. There is no technical difference between a .jpg image and a .jpeg file — they both use exactly the same JPEG compression algorithm and store pictures in the exact same format.
The sole distinction is only in the extension, being a legacy issue 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 reduced to .jpg for Windows computers. Apple and Unix platforms, which never had the character limit, used the longer .jpeg file extension from the beginning.
Even though both file types work identically in nearly all current applications, there are specific scenarios in which a platform might need the .jpeg extension. When this happens, renaming the file from .jpg to .jpeg is here enough.
No real conversion of image data is needed — simply changing the file extension fixes the issue usually.
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