JPEG and JPG are the same file formats. There is absolutely no technical difference between a .jpg file and a .jpeg photo — both formats use exactly the same JPEG encoding method and save image data in the exact same format.
The sole distinction is purely in the suffix, being a historical artifact from early computing. The JPEG format was developed in 1992 by the Joint Photographic Experts Group. The Windows operating system introduced early versions of Windows, the operating system imposed a limitation: file extensions had to be 3 characters.
Which forced the 4-character .jpeg extension to be abbreviated to .jpg for Windows computers. Apple and Unix platforms, without the three-character restriction, used the complete .jpeg file extension from the outset.
While both extensions function the same in free jpg to jpeg tool nearly all today's programs, there are specific situations where a system might need the .jpeg extension. For these situations, renaming the file from .jpg to .jpeg is sufficient.
No real data conversion is needed — just renaming the file extension solves the issue almost always.
Use alljpgconverters.com offering a completely free browser-based JPG to JPEG solution requiring no account required.