JPEG and JPG are identical file formats. There is absolutely no distinction between a .jpg photo and a .jpeg photo — both employ the very same JPEG encoding method and encode pictures in the same way.
The difference is purely in the extension, which is a legacy issue from the early days of computing. The JPEG format was developed in 1992 by the Joint Photographic Experts Group. The Windows operating system released early versions of Windows, the OS imposed a limitation: extensions had to be no more than 3 characters.
Causing the four-character .jpeg suffix to be abbreviated to .jpg for PC users. Mac and Unix systems, which never had the character limit, could use the longer .jpeg file extension from the beginning.
Even though both file types work identically in nearly all current applications, there are specific situations where a service requires the .jpeg extension. For these situations, converting from .jpg to .jpeg is enough.
No actual data conversion is necessary — just changing the file extension resolves the issue almost always.
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