These two formats are identical file formats. There is absolutely no difference between a .jpg image and a .jpeg image — both formats use exactly the same JPEG compression algorithm and store image data in the same way.
The difference is only in the suffix, as it is a legacy issue from early computer history. The JPEG format was developed in 1992 by the Joint Photographic Experts Group. When Microsoft launched early versions of Windows, the OS had a limitation: extensions had to be 3 characters.
This forced the four-character .jpeg suffix to be abbreviated to .jpg for PC users. Apple and Unix platforms, without this extension limitation, used the full .jpeg extension from the outset.
Although both extensions perform equally in almost every modern software, certain cases where a service might need the .jpeg file type. For these situations, changing the extension from .jpg to .jpeg is enough.
No real file conversion is read more needed — simply changing the file extension fixes the issue usually.
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