Free Domain Authority Checker
See how well-linked and how popular any website is, from open web data. Compare up to five at once.
How the authority score works
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Search engines rank a site largely by who links to it. This checker shows how any domain stands on that measure, using open data instead of a private index, so every number can be traced to its source.
Where the score comes from
The Common Crawl project crawls billions of pages and publishes a graph of which domains link to which. It ranks every domain by how well-linked it is, counting links from well-linked sites for more. We hold the best-linked 20 million domains.
What the number means
The score runs from 1 to 100. The best-linked domain on the web scores 100, and the score falls by about 12 points each time the rank drops tenfold. A site ranked around 1,000th scores about 63; around the millionth, about 25.
Popularity rank
A separate measure from the Tranco list, which combines several traffic rankings into a research-grade list of the top million sites. A site can be popular without being well-linked, and the reverse.
Wikipedia citations
How many English Wikipedia articles cite the domain, counted up to 1,000 through Wikipedia's own interface. Editors remove weak sources, so citations are a strong sign of trust.
Domain age
The year the domain was registered, from the public registry record. Age is not a ranking factor by itself, but established domains have had longer to earn links.
If your site has no score
New and small sites are usually outside the top 20 million. That is the normal starting point. The score moves when other sites link to yours.
This is not the “Domain Authority” or “Domain Rating” sold by other tools, which use their own private crawls, and it is not a figure Google uses. It is an independent measure of the same thing: how the rest of the web links to a domain. The web graph is refreshed every few months.
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