These two formats are exactly the same photo formats. There is absolutely no technical difference between a .jpg photo and a .jpeg file — both apply exactly the same JPEG encoding method and store photos in the same way.
The difference is entirely in the file extension, being a historical artifact from the early days of computing. The JPEG format was created in 1992 by the Joint Photographic Experts Group. When Microsoft launched Windows in the early era, the OS enforced a limitation: file extensions had to be three characters long.
Causing the 4-character .jpeg suffix to be reduced to .jpg for Windows users. Non-Windows systems, which never had this three-character restriction, used the longer .jpeg file extension from the outset.
Even though both file types work identically in almost every current applications, some cases in which a system might need the .jpeg extension. In these cases, changing the extension from .jpg to more info .jpeg is all that is needed.
No actual conversion of image data is required — only updating the extension fixes the issue in most cases.
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