Many people have questioned if JPEG and JPG are separate file types, this is very common. This is one of the most popular questions in photo editing, and the explanation is simple: JPEG and JPG are identical image standard.
The only difference is the extension — a 3-character leftover of legacy Windows operating systems which could not use longer extensions. Despite this, there are still cases when it helps to convert files from .jpeg to .jpg.
JPEG stands for Joint Photographic Experts Group, the organization which developed the compression method in 1992. Early versions of Windows required file extensions to be no longer than three characters, which is why the format became JPG.
Today, both extensions are recognized by every operating system, browser and application. Whether a file is stored as image.jpg or image.jpeg, it will open identically.
Despite being the same file type, a few software only accept .jpg files and may reject .jpeg extensions because of the file extension. For these situations, changing the extension from .jpeg to .jpg is enough.
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