JPG and JPEG are exactly the same photo formats. No distinction between a .jpg photo and a .jpeg image — both formats use the very same JPEG compression standard and store photos in the same way.
The only difference is purely in the extension, as it is a historical artifact from the early days of computing. The JPEG format was introduced in 1992 by the Joint Photographic Experts Group. When Microsoft launched Windows in the early era, the system had a restriction: extensions could only be no more than 3 characters.
This forced the four-character .jpeg suffix to be shortened to .jpg for Windows users. Apple and Unix platforms, not having the three-character restriction, used the complete .jpeg file extension from the outset.
Even though both extensions work identically website in nearly all modern software, there are specific cases in which a service requires the .jpeg file type. In these cases, changing the extension from .jpg to .jpeg is all that is needed.
No actual conversion of image data is needed — just changing the extension resolves the compatibility concern almost always.
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