These two formats are exactly the same image formats. No technical difference between a .jpg photo and a .jpeg photo — they both apply the very same JPEG compression algorithm and save pictures in the same way.
The only difference is only in the file extension, which is a legacy issue from the early days of computing. The JPEG format was developed in 1992 by the Joint Photographic Experts Group. Early Windows launched early versions here of Windows, the system had a limitation: file extensions were limited to be 3 characters.
Causing the 4-character .jpeg suffix to be abbreviated to .jpg for PC users. Non-Windows systems, not having the extension limitation, continued using the longer .jpeg file extension from the outset.
Even though both file types function the same in almost every current applications, some cases where a platform may specifically require the .jpeg file type. When this happens, converting from .jpg to .jpeg is sufficient.
No real conversion of image data is required — only changing the file extension solves the compatibility concern almost always.
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