JPG and JPEG are the same file formats. There is absolutely no difference between a .jpg image and a .jpeg image — both formats use exactly the same JPEG compression standard and save image data in the same way.
The difference is purely in the suffix, as it is a legacy issue from the early days of computing. The JPEG format was introduced in 1992 by the Joint Photographic Experts Group. Early Windows introduced early versions of Windows, the OS had a constraint: extensions could only be no more than 3 characters.
Causing the four-character .jpeg suffix to be shortened to .jpg for Windows computers. Apple and Unix platforms, which never had the character limit, could use the complete .jpeg extension from the start.
While both file types work identically in nearly all modern software, certain situations when a platform requires the .jpeg extension. When this happens, changing the extension from .jpg to .jpeg is enough.
No actual data conversion is required — just updating the file extension fixes the issue usually.
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