JPG and JPEG are the same photo formats. No distinction between a .jpg photo and a .jpeg photo — both formats apply the identical JPEG compression standard and save image data in the same way.
The difference is purely in the suffix, as it is a legacy issue from the early days of computing. JPEG was created in 1992 by the Joint Photographic Experts Group. When Microsoft introduced early versions of Windows, the OS had a limitation: extensions were limited to be three characters long.
This forced the 4-character .jpeg extension to be shortened to .jpg for Windows computers. Apple and Unix platforms, without this extension get more info 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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