These two formats are identical file formats. No distinction between a .jpg photo and a .jpeg photo — both employ the identical JPEG encoding method and encode photos in the identical manner.
The only difference is entirely in the extension, which is a historical artifact from early computing. The JPEG format was introduced in 1992 by the Joint Photographic Experts Group. The Windows operating system released early versions of Windows, the OS had a limitation: extensions were limited to be 3 characters.
This forced the 4-character .jpeg suffix to be shortened to .jpg for Windows users. Non-Windows systems, without this three-character restriction, continued using the complete .jpeg extension from the outset.
Although both extensions perform equally in almost every modern software, certain situations when a system may specifically require the .jpeg file type. In these cases, converting from .jpg to .jpeg is sufficient.
No actual file conversion is required — only read more renaming the extension solves the compatibility concern usually.
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