JPG and JPEG are the same file formats. There is absolutely no technical difference between a .jpg file and a .jpeg photo — both formats use the very same JPEG encoding method and store pictures in the identical manner.
The difference is only in the extension, as it is a legacy issue from early computing. JPEG was developed in 1992 by the Joint Photographic Experts Group. The Windows operating system introduced early versions of Windows, the operating system imposed a constraint: file extensions were limited to be no more than 3 characters.
Causing the 4-character .jpeg suffix to be shortened to .jpg for PC users. Non-Windows systems, which never had this character limit, continued using the longer .jpeg file extension from the beginning.
Even though both extensions work identically in nearly all current applications, there are specific scenarios in which a platform requires the .jpeg extension. When this happens, more info 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 almost always.
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