JPG and JPEG are identical file formats. There is absolutely no difference between a .jpg photo and a .jpeg photo — both employ the very same JPEG compression algorithm and encode pictures in the same way.
The difference is purely in the file extension, as it is a relic from early computing. JPEG was introduced in 1992 by the Joint Photographic Experts Group. Early Windows launched Windows in the early era, the operating system enforced a constraint: file extensions could only be three characters long.
Which forced the 4-character .jpeg extension to be shortened to .jpg for Windows computers. Non-Windows check here systems, not having this character limit, used the full .jpeg file extension from the outset.
Although both file types work identically in virtually all current applications, there are specific cases where a platform may specifically require the .jpeg file type. When this happens, changing the extension from .jpg to .jpeg is enough.
No real conversion of image data is necessary — simply updating the file extension resolves the problem almost always.
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