JPEG and JPG are the same photo formats. There is no technical difference between a .jpg file and a .jpeg image — both formats use exactly the same JPEG compression algorithm 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. The Windows operating system released early versions of Windows, the OS had a constraint: extensions were limited to be three characters long.
Which forced the 4-character .jpeg extension to be reduced to .jpg for Windows computers. Apple and Unix platforms, which never had the character limit, could use the longer .jpeg file website extension from the beginning.
Even though both extensions work identically in nearly all current applications, certain cases where a service may specifically require the .jpeg file type. For these situations, changing the extension from .jpg to .jpeg is sufficient.
No actual file conversion is required — only changing the extension solves the compatibility concern in most cases.
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