If you have ever asked whether JPEG and JPG are separate formats, this is very common. This is one of the most common questions in digital imaging, and the explanation is clear: JPEG and JPG are the same file type.
The sole difference is the extension — a three-letter relic of legacy Windows OS unable to 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. Legacy versions of Windows enforced file extensions to be only 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 named image.jpg or image.jpeg, it will open exactly the same.
Although they are the same format, certain legacy systems require .jpg files and can reject .jpeg files because of the extension alone. When this happens, renaming the file extension from .jpeg to .jpg is all you need.
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