To cut a large MP3 file online, you need to use an MP3 cutter app. For your information, some of the best online MP3 cutter apps are mentioned in this article, and you can use any one of them.

MP3 Toolkit is a freeware that includes a total of 6 MP3 file editing tools, lke MP3 converter, CD ripper, Tag editor, MP3 cutter, MP3 merger, MP3 recorder, etc.