Many people have questioned if JPEG and JPG are different formats, you are not alone. This is one of the most common topics in image conversion, and the explanation is straightforward: JPEG and JPG are identical file type.
The sole difference is the file extension — a three-letter relic of legacy Windows OS which could not handle four-character suffixes. Regardless, there are sometimes situations when 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 needed file extensions to be here only three characters, which is why the extension was shortened to JPG.
Today, .jpg and .jpeg are supported by every OS, 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, changing the file extension from .jpeg to .jpg is sufficient.
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