JPEG and JPG are exactly the same image formats. There is no technical difference between a .jpg file and a .jpeg file — both employ the very same JPEG encoding method and encode photos in the identical manner.
The only difference is entirely in the file extension, which is a historical artifact from early computing. JPEG was created in 1992 by the Joint Photographic Experts Group. Early Windows introduced Windows in the early era, the system imposed a restriction: file extensions had to be 3 characters.
Causing the four-character .jpeg suffix to be abbreviated to .jpg for Windows users. Non-Windows systems, without this extension limitation, continued using the full .jpeg file extension from the start.
While both file types function the same in virtually all today's programs, there are specific scenarios in which a platform might need the .jpeg extension. When this happens, changing the extension from .jpg to .jpeg is enough.
No real file conversion is needed — only changing the extension fixes the compatibility concern usually.
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