How do backlink tools work?

There are several types of backlinks tools. Most of the black hat tools work by blasting some text content into the low quality websites that allow auto-posting. They will be posting same text or spun text into hundreds or thousands of websites.  Only the manually created backlinks will survive over a period of time.

Back-link tool works same as spam, Most of the back-link tool will submit on spam websites

Back link tolls are mainly used for submission of links on other website after the registration.