JPG and JPEG are identical photo formats. There is absolutely no distinction between a .jpg file and a .jpeg file — both formats employ exactly the same JPEG compression algorithm and save pictures in the exact same format.
The only difference is purely in the extension, as it is a historical artifact from the early days of computing. The JPEG format was introduced in 1992 by the Joint Photographic Experts Group. The Windows operating system launched Windows in the early era, the system imposed a limitation: extensions had to be no more than 3 characters.
Which here forced the 4-character .jpeg suffix to be abbreviated to .jpg for PC users. Non-Windows systems, not having this character limit, could use the full .jpeg file extension from the outset.
Although both extensions work identically in virtually all today's programs, some 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 — only renaming the extension solves the compatibility concern usually.
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