JPG and JPEG are identical photo formats. There is no difference between a .jpg file and a .jpeg image — both use the identical JPEG encoding method and store image data in the same way.
The only difference is only in the suffix, which is a legacy issue from the early days of computing. The JPEG format was developed in 1992 by the Joint Photographic Experts Group. Early Windows released early versions of Windows, the system enforced a constraint: extensions were limited to be no more than 3 characters.
Which forced more info the 4-character .jpeg suffix to be shortened to .jpg for PC users. Apple and Unix platforms, without this character limit, could use the full .jpeg file extension from the outset.
Even though both file types function the same in almost every current applications, some cases where a platform may specifically require the .jpeg file type. When this happens, renaming the file from .jpg to .jpeg is enough.
No real conversion of image data is needed — simply updating the file extension resolves the compatibility concern in most cases.
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