These two formats are exactly the same image formats. There is no technical difference between a .jpg file and a .jpeg file — they both use the very same JPEG compression algorithm and encode pictures in the identical manner.
The sole distinction is entirely in the extension, which is a historical artifact from early computing. The JPEG format was introduced in 1992 by the Joint Photographic Experts Group. The Windows operating system launched Windows in the early era, the system imposed a restriction: extensions were limited to be 3 characters.
This forced the 4-character .jpeg extension to be reduced to .jpg for Windows users. Non-Windows systems, without the extension limitation, could use the longer .jpeg extension from the outset.
While both file types work identically in nearly all modern software, certain situations in which a platform might need the .jpeg file type. In these cases, converting from .jpg to .jpeg is all that is needed.
No actual file conversion is required — just updating the extension solves the problem almost always.
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