These two formats are exactly the same image formats. There is no technical difference between a .jpg file and a .jpeg file — both employ the very same JPEG encoding method and encode photos in the identical manner.
The only difference is purely in the file extension, which is a relic from early computing. JPEG was created in 1992 by the Joint Photographic Experts Group. Early Windows introduced Windows in the early era, the system imposed a restriction: file extensions had to be 3 characters.
This forced the 4-character .jpeg suffix to be shortened to .jpg for Windows computers. Non-Windows systems, without this extension limitation, used the full .jpeg file extension from the start.
While 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 here is required — only renaming the extension solves the compatibility concern in most cases.
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