These two formats 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 purely in the suffix, as it is a legacy issue from the early days of computing. JPEG was developed 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 outset.
While both file types perform equally in virtually all today's programs, some cases where a service might need the .jpeg file type. For these situations, changing the extension from .jpg to .jpeg is enough.
No actual data conversion is needed — just renaming the extension solves the compatibility concern in most cases.
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