What Is Spam Score in SEO? The Complete 2026 Guide

Spam score is a Moz metric that measures how closely your website resembles domains previously penalized or banned by Google. It uses a scale of 0 to 100 percent. A score under 30 percent is safe. It is not a direct Google ranking factor but it reliably flags the same SEO problems that Google’s own algorithm already targets.

If you found your spam score during a backlink audit and panicked, stop. Before disavowing every link pointing to your site, you need to understand what this metric measures, what range is dangerous and which fixes are need to perform immediately.

What is a Spam Score and Why Does It Exist?

Spam score is a third-party SEO metric created by Moz in 2015. The original model used 17 spam signals to evaluate websites. The current version analyzes 27 distinct machine-learned signals trained on millions of sites that Google has penalized or banned.

The metric estimates how closely your website resembles those penalized sites. The higher the percentage, the more your site patterns match what Google has historically punished.

Moz built this tool to give SEO professionals a way to evaluate link quality and site health before problems become penalties. It works as an early warning system for your backlink profile and on-page SEO hygiene.

Google has publicly confirmed it does not use Moz spam score in its ranking algorithm. However, Google’s own internal spam detection system called SpamBrain targets many of the same patterns Moz flags. That overlap is why a high spam score still deserves attention even though it is not a direct ranking signal.

The Three Risk Bands of Spam Score in SEO: What Your Score Tells You

Moz divides all spam scores into three zones. Each zone points to a different course of action.

0 to 30 percent — Low Risk

Your site shares few characteristics with penalized domains. No immediate action is needed. Run a quarterly check to monitor for changes and continue building quality links.

31 to 60 percent — Medium Risk

This range signals a problem worth investigating. The most common causes at this level include missing trust pages, no HTTPS, leftover meta keyword tags, or a cluster of low-quality backlinks pointing to your domain. Most of these fixes take one afternoon.

61 to 100 percent — High Risk

This range requires a full backlink audit. First check Google Search Console for any manual action warnings. Sites with high Moz scores sometimes rank perfectly well because Google’s own evaluation of those links differs from Moz’s model.

One decision rule worth saving: if your score is elevated but rankings are stable and Google Search Console shows no manual actions, the risk is lower than the number suggests. 

The 27 Signals Moz Uses to Calculate Spam Score

Moz groups its 27 signals into four core categories. Knowing these helps you audit the right areas when your score is unexpectedly high.

Domain-Level Signals

Backlink and Link Profile Signals

On-Page and Trust Signals

Technical SEO Signals

How to Check Your Spam Score for Free

The most accurate and direct way to check your spam score is through Moz Link Explorer. It gives three free domain reports per day without requiring any login or credit card.

Here is the exact process:

1. Go to moz.com/link-explorer
2. Type your full domain including the https prefix
3. Hit enter and navigate to the Spam Score tab in your results
4. Read your percentage and note any highlighted risk signals

For competitor research, you can enter any competing domain into the same tool and compare their spam profile against yours. This is useful when evaluating potential link partners before you pursue a backlink from their site.

The MozBar Chrome extension also lets you see spam scores while browsing any website directly in your browser toolbar. This saves time during manual link prospecting.

Spam Score vs. Toxic Score: What is the Difference

These two metrics get confused constantly and they are not interchangeable.

Spam score is a site-level metric. Moz evaluates the overall patterns of an entire domain across 27 signals and returns one single percentage for the whole site. It gives you a bird’s eye view of domain health.

Toxic score is Semrush’s link-level metric. It evaluates individual backlinks using over 50 quality markers and classifies each link as non-toxic, potentially toxic or toxic. It gives you a microscope view of specific harmful links.

Use spam score when you want a quick assessment of an entire domain before pursuing it as a link partner or before accepting a guest post from that site. Use toxic score when you need to identify exactly which links inside your own profile are creating problems.

How to Reduce Spam Score: 6 Easy Fixes

Reducing spam score takes patience because Moz updates scores quarterly. Focus on the fixes that address the most common signals and let the numbers catch up over time.

Fix 1: Audit Your Backlink Profile

Use Moz Link Explorer or Semrush Backlink Audit to find links from low-authority or penalized domains. Export the list and review each domain manually. Look for patterns such as entire networks of irrelevant sites linking to you rather than isolated links.

Fix 2: Add Missing Trust Pages

Missing contact information, privacy policy and about pages trigger multiple Moz flags at once. Create basic versions of each page. These pages signal legitimacy to search engines and to real users who want to evaluate your site before trusting your content.

Fix 3: Understand the Disavow Myth before Using That Tool

This is the single most common mistake in spam score management. Google’s Disavow Tool does not lower your Moz spam score. Moz cannot access your Google disavow file. These are completely separate systems with no connection. Disavow tells Google to ignore certain links. It has zero effect on your Moz percentage.

Use the Disavow Tool only after confirming through manual outreach that a link is genuinely harmful and the site owner refuses to remove it. Over-disavowing removes real link equity and can hurt rankings.

Fix 4: Switch to HTTPS and Remove Meta Keyword Tags

If your site still runs on HTTP in 2026, switching to HTTPS is non-negotiable. Missing HTTPS is a direct spam signal in Moz’s model and a confirmed trust issue for Google. Also remove any meta keyword tags from your pages. This tag does nothing for modern SEO and its presence is one of the 27 Moz spam signals.

Fix 5: Diversify Your Anchor Text Profile

If most of your backlinks use the same exact keyword phrase as anchor text, that pattern looks manipulative to both Moz and Google’s SpamBrain. A natural link profile contains branded anchors, partial match phrases, generic text like “click here” or “read more,” and naked URLs mixed together without any one type dominating.

Fix 6: Improve Internal Linking and Content Depth

Thin pages with few internal links look like low-effort content in Moz’s model. Audit your site for orphaned pages and connect them through relevant internal links. Expand thin pages to provide genuine value so search engines treat them as real resources.

Spam Score and AI Search Visibility in 2026

In 2026 AI platforms including Google AI Overviews and Perplexity use spam signals as filters when deciding which websites to cite inside generated answers. A site with a high spam score and weak E-E-A-T has a lower chance of being cited as a source in AI responses.

This makes spam score a GEO concern alongside a traditional SEO concern. Cleaning your spam signals protects your Google rankings and increases your chances of appearing in AI search results that now drive a meaningful share of organic traffic.

Conclusion

Spam score is a diagnostic tool and not a sentence. A number above 30 percent tells you to investigate, not to panic-delete every backlink you have ever earned. Start with the free fixes: add trust pages, switch to HTTPS and review your anchor text spread. Check your score quarterly and treat it as a routine part of your SEO health audit. Clean spam signals protect your rankings today and improve your chances of being cited in AI search tomorrow.

At FHSEOHub we build backlinks from the organically ranked website which provide a healthy backlink profile and reduce the spam score.