It is necessary to build a strong backlink profile which is useful while doing the search engine optimization of your website. The links should be robust and of good quality while being relevant to your business. At the same time, you also need to weed out the links which are down or nofollow or have other quality related issues. Of course many SEO companies resort to the unethical methods called black hat SEO and buy backlinks, but this practice can actually get your website banned on Google. This is the reason that you need to only opt for ethical methods in obtaining backlinks. It is also necessary to check the quality of the links that you are adding, and for that you can use a backlink checker available on the internet.
Tool Summary: You can check the Backlink Checker of any URL with the Backlink Checker.
Usage Tips: Run this mass Backlink Checker tool for all your website's page.