JPG and JPEG are exactly the same file formats. There is no difference between a .jpg photo and a .jpeg file — both formats employ exactly the same JPEG encoding method and encode image data in the identical manner.
The sole distinction is purely in the extension, being a relic from early computing. The JPEG format was created in 1992 by the Joint Photographic Experts Group. The Windows operating system released Windows in the early era, the operating system had a restriction: file extensions were limited to be 3 characters.
Which forced the 4-character .jpeg suffix to be reduced to .jpg for Windows computers. Non-Windows systems, which never had the three-character restriction, could use the more info full .jpeg file extension from the outset.
Even though both file types perform equally in nearly all today's programs, certain cases in which a platform may specifically require the .jpeg extension. In these cases, converting from .jpg to .jpeg is enough.
No real data conversion is needed — simply updating the extension fixes the issue almost always.
Use alljpgconverters.com for a totally free web-based JPG to JPEG tool with no download needed.