These two formats are identical file formats. There is absolutely no difference between a .jpg image and a .jpeg image — both formats apply the identical JPEG compression algorithm and store image data in the identical manner.
The only difference is entirely in the file extension, which is a relic from early computing. The JPEG format was introduced in 1992 by the Joint Photographic Experts Group. The Windows operating system launched early versions of Windows, the OS had a limitation: extensions were limited to be 3 characters.
This forced the 4-character .jpeg suffix to be reduced to .jpg for Windows users. Mac and Unix systems, without this three-character restriction, could use the longer .jpeg extension from the beginning.
Even though both extensions work identically in nearly all current applications, there are specific cases where a service might need the .jpeg extension. For these situations, changing the extension from .jpg to .jpeg is click here enough.
No real conversion of image data is needed — simply updating the file extension resolves the issue almost always.
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