These two formats are identical image formats. There is no technical difference between a .jpg image and a .jpeg file — they both use exactly the same JPEG compression algorithm and store image data in the exact same format.
The difference is only in the suffix, as it is 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 imposed a limitation: extensions had to be 3 characters.
This forced the 4-character here .jpeg suffix to be abbreviated to .jpg for Windows users. Mac and Unix systems, not having this three-character restriction, continued using the complete .jpeg extension from the outset.
Although both extensions perform equally in almost every modern software, certain cases when a system may specifically require the .jpeg file type. For these situations, converting from .jpg to .jpeg is sufficient.
No actual file conversion is required — only renaming the extension solves the compatibility concern in most cases.
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