Many people have questioned whether JPEG and JPG are different formats, this is a frequent question. It is one of the most popular questions in digital imaging, and the answer is clear: JPEG and JPG are identical format.
The only difference is the suffix — a 3-character relic of legacy Windows operating systems unable to support four-character file extensions. Despite this, there are occasionally situations where it helps to change images from .jpeg to .jpg.
The name JPEG means Joint Photographic Experts Group, the group which developed the compression method in 1992. Older versions of Windows enforced extensions to be no longer than three characters, that is why the extension became JPG.
Currently, .jpg and .jpeg are recognized by every OS, web browser and program. No matter if a file website is saved as image.jpg or image.jpeg, it opens the same way.
Even though they are the same file type, some older systems specifically expect .jpg files and may reject .jpeg files based on the extension alone. In these cases, renaming the file extension from .jpeg to .jpg is enough.
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