JPG and JPEG are exactly the same file formats. No technical difference between a .jpg file and a .jpeg file — both apply the identical JPEG encoding method and store image data in the same way.
The difference is purely in the suffix, as it is a relic from early computing. JPEG was introduced in 1992 by the Joint Photographic Experts Group. Early Windows introduced Windows in the early era, the operating system had a limitation: extensions could only be three characters long.
Which forced the 4-character .jpeg extension to be reduced to .jpg for Windows users. Mac and Unix systems, without this three-character restriction, used the longer .jpeg extension from the start.
Although both file types work identically in nearly all current applications, certain cases where a service might need the .jpeg extension. When this happens, renaming the file from .jpg to .jpeg is all that is needed.
No image data conversion is required — just updating the file extension resolves the problem almost always.
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