JPG and JPEG are the same file formats. No distinction between a .jpg photo and a .jpeg photo — both formats apply the identical JPEG compression standard and save photos 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 OS imposed a limitation: extensions were limited to be 3 characters.
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 nearly all current applications, there are specific scenarios in which a service 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 website the compatibility concern usually.
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