These two formats are identical file formats. There is absolutely no difference between a .jpg image and a .jpeg image — both formats apply the identical JPEG compression standard and save image data in the same way.
The difference is purely in the file extension, as it is a relic 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 had 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 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 enough.
No real conversion of image data is needed — simply changing the extension read more fixes the issue usually.
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