JPEG and JPG are exactly the same photo formats. No distinction between a .jpg photo and a .jpeg photo — both 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 beginning.
Even though both file types work identically in nearly all current applications, there are specific scenarios where a service might need the .jpeg file type. For these situations, changing the extension from .jpg to .jpeg is enough.
No actual file conversion is required — only renaming the extension solves the compatibility concern in most cases.
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