These two formats are identical image formats. There is no technical difference between a .jpg file and a .jpeg file — they both employ the very same JPEG compression algorithm and store image data in the same way.
The only difference is entirely in the extension, being a legacy issue from the early days of computing. JPEG was introduced in 1992 by the Joint Photographic Experts Group. The Windows operating system launched Windows in the early era, the operating system enforced a constraint: extensions could only be three characters long.
Which forced the 4-character .jpeg extension to here be reduced to .jpg for Windows computers. Apple and Unix platforms, without the extension limitation, used the full .jpeg file extension from the start.
While both file types function the same in virtually all current applications, there are specific scenarios when a system may specifically require the .jpeg extension. In these cases, changing the extension from .jpg to .jpeg is sufficient.
No image conversion of image data is needed — simply changing the extension resolves the issue usually.
Use alljpgconverters.com providing completely free browser-based JPG to JPEG converter without software required.