Website Backlinks Checker
Get any domain's real Open PageRank score — calculated from Common Crawl's index of 2 billion+ pages — plus estimated backlink count and domain authority.
Examples: wikipedia.org · github.com · nytimes.com
About This Tool
Open PageRank (OPR) is a free, open implementation of Google's original PageRank algorithm applied to Common Crawl data — a non-profit crawl of 2+ billion web pages. The score (0–10) measures link authority: how many pages link to a domain and how authoritative those linking pages are. It's the closest free equivalent to Moz Domain Authority or Ahrefs Domain Rating.
The OPR score itself is real and calculated from actual Common Crawl link data. The backlink count is an estimate derived from the score — OPR is a PageRank value, not a raw link count. Each OPR point roughly corresponds to 10× more links (logarithmic). For exact counts, use Ahrefs or Semrush.
Common Crawl indexes the most-linked and most-visited pages. Very new domains, low-traffic sites, or sites that block crawlers may not yet be indexed. OPR covers hundreds of millions of domains — if yours is missing, it likely has very few inbound links yet.
Backlinks = total number of individual links pointing to your site (one domain can link to you 1,000 times). Referring domains = number of unique domains linking to you. Referring domains is generally more valuable: 100 links from 100 different sites is stronger than 100 links from 1 site.
Register at openpagerank.com — no credit card needed. The free tier gives 5,000 lookups per month. Add your key as VITE_OPR_KEY in your .dev.vars file (local dev) and as an environment variable in your Cloudflare Workers dashboard (production).