These two formats are identical image formats. There is no difference between a .jpg file 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. When Microsoft released early versions of Windows, the website OS had a limitation: extensions were limited to be three characters long.
This 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 necessary — simply updating the file extension resolves the issue almost always.
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