These two formats are identical file formats. There is absolutely no difference between a .jpg image and a .jpeg image — both formats use exactly the same JPEG compression standard and store image data in the same way.
The difference is only in the suffix, 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 OS imposed a limitation: extensions were limited to be 3 characters.
This forced the 4-character .jpeg extension to be website 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, there are specific 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 — simply updating the file extension fixes the issue usually.
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