JPG and JPEG are the same photo formats. No distinction between a .jpg photo and a .jpeg image — both formats apply exactly the same JPEG compression standard and store image data in the same way.
The difference is only in the suffix, being a legacy issue from early computer history. The JPEG format was developed in 1992 by the Joint Photographic Experts Group. The Windows operating system launched Windows in the early era, the operating system enforced a constraint: file extensions could only be no more than 3 characters.
Which forced the four-character .jpeg suffix to be reduced to .jpg for PC users. Mac and Unix systems, not having the three-character restriction, continued using the complete .jpeg extension from the outset.
Although both extensions perform equally in virtually all today's programs, some situations when a platform requires the .jpeg extension. When this happens, renaming the file from .jpg to .jpeg is all that is needed.
No real conversion of image data is necessary — simply updating the file extension resolves the issue usually.
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