JPEG and JPG are exactly the same image formats. There is no technical difference between a .jpg file and a .jpeg photo — both employ the identical JPEG encoding method and save photos in the identical manner.
The only 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 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 cases where a service may specifically require the .jpeg file type. For these situations, changing the extension from .jpg to .jpeg is sufficient.
No actual file conversion is required — only renaming the extension solves the problem in most cases.
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