JPG and JPEG are exactly the same image formats. There is no technical difference between a .jpg file and a .jpeg photo — both employ the very same JPEG compression standard and store image data in the same way.
The difference is only in the suffix, being a legacy issue from the early days of computing. The JPEG format was developed in 1992 by the Joint Photographic Experts Group. The Windows operating system released early versions of Windows, the more info operating system enforced a restriction: file extensions had to be 3 characters.
This forced the 4-character .jpeg extension to be reduced to .jpg for PC users. Mac and Unix systems, not having this extension limitation, used the full .jpeg extension from the outset.
Although both file types function the same in nearly all current applications, there are specific scenarios in which a platform requires the .jpeg extension. When this happens, renaming the file from .jpg to .jpeg is enough.
No real file conversion is needed — only changing the extension fixes the compatibility concern in most cases.
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