JPEG and JPG are exactly the same image formats. There is no technical difference between a .jpg image and a .jpeg file — they both use exactly the same JPEG compression algorithm and store image data in the exact same format.
The sole distinction is only in the suffix, being a legacy issue from early computer history. The JPEG format was developed in 1992 by the Joint Photographic Experts Group. When Microsoft released early versions of Windows, the OS had a limitation: extensions were limited to be three characters long.
This forced the 4-character .jpeg extension to be shortened to .jpg for Windows computers. Apple and Unix platforms, without the extension limitation, used the full .jpeg file extension from the beginning.
Even though both file types work identically in nearly all current applications, there are specific scenarios in which a service might need the .jpeg extension. When this happens, changing the extension from .jpg to .jpeg is enough.
No real conversion website of image data is needed — simply changing the file extension fixes the issue usually.
Use alljpgconverters.com providing 100 percent free web-based JPG to JPEG converter requiring no software needed.