JPEG and JPG are exactly the same image 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, as it is a legacy issue from the early days of computing. JPEG was created in 1992 by the Joint Photographic Experts Group. When Microsoft introduced early versions of Windows, the system imposed a limitation: extensions were limited to be 3 characters.
This forced the 4-character .jpeg suffix 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, there are specific scenarios in which a platform might need the .jpeg extension. When this happens, changing the extension from .jpg to .jpeg is enough.
No real conversion of image data is needed — simply changing the extension fixes the issue usually.
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