What is spam score?
Spam score is a percentage attached to a domain by SEO tools, most famously Moz, that predicts how closely the site resembles sites search engines have already penalized or banned. It is built from a list of signals observed on known spam domains: very few pages, very many links with keyword-stuffed anchor text, a thin or missing contact page, a top-level domain that spammers favor, an unusually high ratio of links to content, and dozens more. The more of those flags a site trips, the higher its score.
It is a prediction, not a verdict. A spam score of 60 percent does not mean the site has been penalized. It means it looks like sites that were. Google has no such number and does not use Moz's; the score exists so that people doing link audits have a quick way to sort thousands of linking domains into "probably fine" and "worth a closer look".
Why it matters
Why spam score matters
Links from bad neighborhoods can hurt. A site whose backlink profile is full of link farms, hacked pages and auto-generated directories looks, to a search engine, like a site that bought or built those links, and the consequence ranges from the links being ignored to a manual penalty. Spam score is the fastest way to find those neighborhoods in a profile of several thousand domains, and it is used in the other direction too: before pursuing a link from a site, checking its score avoids wasting effort on one that will do nothing or do harm.
It matters for a brand's own domain as well. A high score on your own site is a warning that something in its structure or link profile reads as low quality, even if every page is honest.
In practice
How spam score works in practice
- 01
A link audit pulls the full list of domains linking to a site and sorts it by spam score. The high scorers are reviewed by hand, because the tool is often wrong: a perfectly good niche forum can score high for having few pages and odd formatting, while a sophisticated paid-link network can score low. Links judged genuinely toxic go into a disavow file submitted to Google, which tells it to ignore them. Links that merely look odd are left alone.
- 02
The same pass is run on a site's own domain. If the score is high, the flags that triggered it are listed in the tool, and most are fixable: add the contact and about pages, cut the thin pages, clean up anchor text on inbound links where possible, and stop any link practices that resemble a scheme.
Watch out
What people get wrong about spam score
Treating it as Google's opinion. It is a third-party model with known blind spots, and disavowing every link above an arbitrary threshold throws away good links along with bad. The opposite mistake is ignoring it entirely and letting a profile fill with junk because "Google ignores bad links anyway." Google mostly does, but a profile that is overwhelmingly spam is a different situation from one with a few stray bad links. The score is a flashlight, not a judge.
