JPEG and JPG are exactly the same image formats. There is no technical difference between a .jpg file and a .jpeg file — both employ the very same JPEG compression algorithm and save image data in the same way.
The only difference is purely in the suffix, as it is a legacy issue from the early days of computing. JPEG was introduced in 1992 by the Joint Photographic Experts Group. Early Windows launched Windows in the early era, the operating system had a constraint: extensions were limited to be three characters long.
This forced the 4-character .jpeg suffix to be shortened to .jpg for PC users. Apple and Unix check here platforms, not having the extension limitation, used the longer .jpeg extension from the outset.
Although both file types function the same in virtually all today's programs, some situations when a system may specifically require the .jpeg file type. For these situations, changing the extension from .jpg to .jpeg is sufficient.
No image data conversion is necessary — simply changing the file extension fixes the issue usually.
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