JPEG and JPG are exactly the same image formats. There is no technical difference between a .jpg file and a .jpeg file — they both use exactly the same JPEG compression algorithm and store image data in the same way.
The difference is purely in the suffix, as it is a relic from the early days of computing. JPEG was created in 1992 by the Joint Photographic Experts Group. Early Windows introduced Windows in the early era, the system enforced a restriction: file extensions could only be no more than 3 characters.
Which forced the four-character .jpeg extension to be reduced to .jpg for PC users. Apple and Unix platforms, which never had the character limit, used the longer .jpeg file extension from the beginning.
Even though both file here types function the same in virtually all today's programs, some scenarios in which a platform requires the .jpeg extension. When this happens, renaming the file from .jpg to .jpeg is all that is needed.
No image conversion of image data is necessary — just updating the file extension resolves the problem in most cases.
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