Back-link is an important ranking factor taken into account by all search engines. There are many free online back-link checker tool that can help you to analyse your back-links and make further improvement on the SEO of your blog.

The following are the 7 top back-link analysis tools.

1. SEMRush

SEMRush is a leading SEO tool that you can use to perform backlink analysis. To use SEMRush to analyze your backlinks, you must first visit the homepage of SEMRush and fill in the registration form in the left. It is completely free to sign up for the SEMRush account. As soon as you have signed up, you can start using it to check your backlinks. You simply enter your domain name into the search box on top of the dashboard to analyze it. After you press Enter, you must go to Backlinks on the left to see the list of backlinks that are pointing to your site. You can go to the Referring domains to see the list of site that are pointing to you. It also reveal how many unique Ips are referring to your domain and the referring domains by country. The dashboard also reveal other information on your backlinks such as number of dofollow and nofollow links, number of text links, frame links, form links and image links. It also give you a detailed statistic on what types of top level domains are pointing to your site.

2. Rank Signals

Rank Signals is a free backlink checker tool that can quickly analyze your site and return how many unique domain backlinks you have. It also show you the Pagerank of the analyzed domains. It will show you the title and URL of the blog post that is pointing to your site. If it is linking to image, it will list the image URL. Rank Signals provides detailed information on the internal and external backlinks.

3. Linkody

Linkody is a free backlink analysis service that will show you the top 100 backlinks to your site. They offer a free 30 days trial. It lists the referring URL, anchor keyword, dofollow/nofollow and the page authority. It also let you know whether the backlink has been shared on the social media platform.

4. Ahrefs

Ahrefs is a recognized backlink analysis tool that allows you to perform the backlink analysis of a rival site. This is a paid backlink tool but it lets you perform backlink analysis on 3 sites. You will be asked to provide your credit card details before it will give you access to the backlink checker tool. Ahrefs provides a detailed analysis of the backlinks on your site including total backlinks, referring IPs, government links, education links, and referring subdomains. There is a graph that show how many social shares your website has. The graph provides details on the number of social shares including Google + 1, tweets and Facebook likes. The search result of the backlinks can be exported in the form of a CSV file.

5. Majestic

Majestic backlink history checker tool can analyze how many backlinks are pointing to your site. It shows details of the backlinks from referring domains, subdomains and URLs. If you are a registered user, you can perform comparison on the backs of up to 5 domains. There is no need to provide your credit card details to become a registered user. You can filter ourt backlinks frrom up to 5 URLs for a single domain. The report also allow you to filter out errors such as 404 and 300.

6. Open Site Explorer

Open Site Explorer is a free backlink checker tool provided by Moz. Open Site Explorer lets you know the total number of backlinks as well as how many root domain links your website. It will list the quality inbound links that are pointing to your site at the bottom. If you are a Moz Pro subscriber, you can enjoy benefits such as retrieve up to 10,000 inbound links, no limit on how many reports you can generate, track links, and social data. There is a 30 days free trial for Moz Pro.

7. Cognitive SEO Explorer Tool

Cognitive SEO provides a free backlink Explorer tool that lets you explore the backlinks to your site. The free trial only provide information on up to 25 links. It lists the full URL of the referring domain, the link authority, domain URL and the date the backlink was last crawled by the search engines. If you want to see details for more than 25 links, you have to register for an account. There is a graph that shows how many new links the site get every month and how many links the site lost every day.