Many people have wondered whether JPEG and JPG are separate formats, this is a frequent question. It is one of the most popular topics in photo editing, and the response is straightforward: JPEG and JPG are identical file type.
The sole difference is the file extension — a three-letter leftover of legacy Windows OS which could not support four-character extensions. Regardless, there are sometimes cases where it helps to change files from .jpeg to .jpg.
JPEG stands for Joint Photographic Experts Group, the group which developed the format in 1992. Early versions of Windows enforced file extensions to be no longer than 3 characters, which is why the extension was shortened to JPG.
Today, .jpg and .jpeg are supported by every platform, browser and program. Regardless of whether a file is stored as image.jpg or image.jpeg, it opens identically.
Even though they are the identical format, a few platforms specifically expect .jpg extensions and may reject .jpeg extensions based on the file extension. In these cases, changing the extension from .jpeg to .jpg is sufficient.
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