JPG and JPEG are exactly the same photo formats. There is absolutely no technical difference between a .jpg photo and a .jpeg image — they both apply exactly the same JPEG encoding method and save image data in the exact same format.
The only difference is only in the file extension, as it is a legacy issue from early computing. The JPEG format was introduced in 1992 by the Joint Photographic Experts Group. Early Windows released Windows in the early era, the OS enforced a limitation: file extensions were limited to be no more than 3 characters.
This forced the four-character .jpeg extension to be reduced to .jpg for Windows users. Apple and Unix platforms, without the three-character restriction, could use the complete .jpeg extension from the start.
Although both file types perform equally in nearly all today's programs, certain scenarios when a service requires the .jpeg file type. When this happens, changing the extension from .jpg to .jpeg is jpg jpeg difference all that is needed.
No image file conversion is necessary — just changing the file extension solves the issue almost always.
Use alljpgconverters.com for a totally free online JPG to JPEG tool with no download needed.