JPG and JPEG are identical file formats. There is absolutely no difference between a .jpg image and a .jpeg image — both formats apply exactly the same JPEG compression standard and save image data in the same way.
The difference is purely in the file extension, 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 imposed a restriction: file extensions had to be no more than 3 characters.
Causing the four-character .jpeg suffix to be abbreviated to .jpg for Windows users. Mac and Unix systems, not having read more the three-character restriction, could use the longer .jpeg extension from the outset.
Although both extensions perform equally in almost every modern software, certain cases where a system may specifically require the .jpeg file type. For these situations, changing the extension from .jpg to .jpeg is sufficient.
No actual file conversion is required — only changing the extension solves the compatibility concern in most cases.
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