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 store image data in the same way.
The difference is only in the suffix, being a legacy issue from early computer history. The JPEG format was developed in 1992 by the Joint Photographic Experts Group. When Microsoft released early versions of Windows, the OS had a limitation: extensions were limited to be 3 characters.
This forced the 4-character .jpeg extension to be shortened to .jpg for Windows computers. Non-Windows systems, without this extension limitation, used the full .jpeg file extension from the start.
Even though both file types work identically in nearly all current applications, there are specific scenarios where a service might need the .jpeg file type. For these situations, changing the extension from .jpg to .jpeg is enough.
No actual file conversion is required — only renaming the extension solves the compatibility concern in most cases.
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