Moz Spam Score Explained: What It Means and When to Worry

Moz Spam Score explained in one line: it is the share of sites with features similar to yours that Moz has found penalized or banned by Google, so it measures resemblance, not guilt. It is not a Google metric and it is not a penalty. This guide walks through what the number is built from, why small and new sites often score high, when it actually deserves your attention, and how to use it when you vet another site.

Published: 2026-10-16 · 10 min read · Satelo

What Moz Spam Score actually measures

According to Moz's help page on Spam Score, the number is the percentage of sites with similar features to the one you are researching that Moz has found to be penalized or banned by Google. It comes from a machine learning model that Moz trained on a large set of known penalized and banned domains, and that model settled on 27 features those domains tend to share.

Read that definition twice, because most of the confusion around Spam Score comes from skipping it:

• It is a correlation. A score of 40% does not mean your site is 40% spam. It means that among sites that look like yours on those 27 features, Moz saw that share get penalized or banned.
• It is about your site, not your backlinks. Moz's guide to investigating Spam Score says plainly that the score does not depend on your backlink profile. It reflects your own site's features, setup and content.
• It is Moz's model, built from Moz's crawl. Spam Score is a Moz metric, not a Google one: Google does not publish a "spam score" you can look up. Google's own rules live in its spam policies, and none of them refer to a third-party percentage.

Moz itself is careful here: its help page says a high score does not mean a site is necessarily spammy, only that it is worth investigating further.

Low, medium and high: the official bands

Moz splits the scale into three bands. The table below adds what each band usually means in practice.

You may also see "--" instead of a number. Moz's FAQ explains that this means the site has not been evaluated yet. It is not a zero and not a warning.

Moz also says Spam Score is updated quarterly, and that an individual site's score only moves when its crawlers detect changes to the signals. So if you fix something today, expect to wait for a later update before the number changes.

The 27 signals, grouped so they make sense

Moz lists all 27 signals on its help page and notes that the numbering says nothing about importance. Rather than copy the list, here is what they fall into. For the exact wording of each signal, use the official list.

Two things jump out. First, a big chunk of the list is about how a site is built (trackers, fonts, a favicon) rather than about anything a reader would call spam. Second, several signals describe exactly what a brand-new blog looks like: a handful of pages, little traffic, no phone number, no ad tags.

Why small and new sites often score high

If you run a young niche blog, a medium or even high Spam Score is not unusual, and it rarely means you did something wrong. A typical pattern, for illustration:

A six-month-old hobby blog on a .xyz domain, 25 posts, no contact page, no analytics or ad tags, no favicon, and a long hyphenated domain name. It has never bought a link or published anything shady. Several Moz signals still fire: small page count, low visit rank, TLD, hyphens, missing email and phone, no favicon, none of the common tracking tags.

Nothing in that list breaks Google's rules. The blog simply looks, on paper, like many throwaway spam sites do: small, anonymous and stripped down. That is the core limit of any correlation model. It cannot tell a minimalist side project from a disposable spam domain when their surface features match.

Moz is explicit about this in its investigation guide: because the score is based on correlation rather than causation, the fix is not necessarily to change those factors, and in many cases you may choose not to change anything.

When a high Spam Score is worth worrying about

The number alone is never the reason to act. These are the situations where it deserves real attention:

1. You have a manual action. Open the Manual actions report in Google Search Console. If it lists an issue, that is a real Google problem, and fixing it matters far more than any third-party score.
2. The score jumped and you don't know why. A sudden rise can mean Moz's crawler found new pages full of spam-topic words or odd outbound links. That is a classic sign of a hacked site or injected pages. Search your site for pharma, casino or adult terms and check recently created URLs.
3. Your comments or user pages carry spam links. Spam comments add outbound links with spam-topic anchors. Clean them up and qualify user links with rel="ugc", as covered in our guide to nofollow vs sponsored vs UGC.
4. You are buying content or links on another site. A high score on a site you are about to pay is a cue to look harder before you spend money (more on that below).
5. Buyers keep rejecting your site. If you sell or exchange guest posts, some buyers filter by Spam Score. That is a commercial problem, not a ranking one, but it is real.

Situations where you can relax: the score is medium or high, your site is small or new, there is no manual action, and the signals that fire are about size, domain name or missing trackers.

How to lower your Spam Score without gaming it

Only fix things that also make the site better for people. A practical checklist, roughly in order of value:

• Force HTTPS. Type the http:// version of your domain into a browser and confirm it redirects to https://.
• Add real contact details. A contact page with an email address, and a phone number if you are a business, helps readers trust you. It also happens to cover two signals.
• Add a favicon. Five minutes of work, and it makes your tabs and bookmarks recognizable.
• Fix titles and meta descriptions. Neither empty nor stuffed. Remove the meta keywords tag if your theme still outputs one.
• Check canonical tags. Each page should normally point to itself, not to a different domain, unless you deliberately syndicate.
• Clean outbound links. Remove spam comments, old sitewide footer links and pages that are mostly links. Qualify paid or sponsored links with rel="sponsored".
• Look for hacked content. Run a site:yourdomain.com search plus a spam-topic word and see what comes up.
• Keep publishing. The page-count and visits signals improve on their own as the site grows.

What not to do: don't add Google Tag Manager, ad tags or a Facebook pixel you don't need just to tick a box. Doing that adds page weight and privacy obligations to change a third-party number that Google doesn't use.

Disavow: usually not the answer

A lot of forum advice says "high spam score, disavow your bad links." That mixes up two different things. As noted above, Moz says your own Spam Score does not depend on your backlinks, so disavowing links won't lower it. Moz's guide says directly that disavowing is not the best way to improve the score.

Google's own guidance points the same way. Its disavow links help page calls the tool an advanced feature to use with caution, says most sites will not need it, and suggests disavowing only if you have a considerable number of spammy, artificial or low-quality links and those links have caused, or likely will cause, a manual action. A Moz percentage meets neither condition.

The Spam Score breakdown of your linking domains in Link Explorer is useful for another reason: it sorts your backlinks so you can review the riskiest-looking ones first. Moz recommends checking each site's content and relevance before you decide anything.

Using Spam Score to vet a site before you buy or exchange

This is where Spam Score earns its keep. If you are about to pay for a guest post or agree to a content exchange, a high score is a fast "look closer" flag. Use it as step one of a short review:

1. Check the score and the band. Low: carry on with your usual checks. Medium: normal for small sites. High: read on before you pay.
2. Open the site like a reader. Is the content written for people, or is it a wall of unrelated "guest posts" on every topic?
3. Look at outbound links. Do recent posts link to casinos, loans or pills with exact-match anchors? Is there a "write for us, any niche" page with a price list?
4. Compare with other metrics. High authority, high Spam Score and almost no traffic is a well-known pattern for link farms. Our guide on how to spot PBN sites covers the rest of the footprints, and domain authority explained shows how far authority scores can drift from real visibility.
5. Check history. A domain that changed topic recently, or was obviously bought expired, deserves extra caution.

For a full pre-purchase routine, see our guide to checking a site before buying a guest post.

A reminder that matters more than any score: Google's spam policies treat buying links to manipulate rankings as link spam, and paid placements are fine only when the links are qualified with rel="sponsored" or rel="nofollow". A low Spam Score does not make an unqualified paid link safe.

Where to check Spam Score for free

Moz shows Spam Score in Link Explorer and in the Links section of a Moz Pro campaign. At the time of writing, Moz's Link Explorer page offers 10 free queries per month with a free Moz Community account, and Spam Score is among the metrics shown. Many third-party "spam score checker" sites simply resell Moz's number, so going to the source is usually the better option.

Keep in mind what Moz states in its FAQ: it cannot tell you which specific signals fired for your site. You have to compare your site against the list yourself, which is what the grouped table above is for.

How Satelo treats Spam Score

Satelo's Quality Score is built mostly from open data: Tranco rank, domain age, Common Crawl coverage, PageSpeed and, where available, traffic verified by the Satelo plugin. For sites where we also have a Moz Spam Score (it arrives with the Semrush data we pull for some sites), a Spam Score of 60% or higher lowers the Quality Score and adds a spam-risk flag. When there is no Spam Score on file, it plays no part in the number.

We use it as a reason for caution, not as a verdict, for the same reasons Moz gives: it is a correlation, and small honest sites can trip it.

What to do next

• Today: open Search Console's Manual actions report. If it is empty, a medium or high Spam Score is a to-do list, not an emergency.
• This week: go through the checklist above and fix only what helps readers too: HTTPS, contact details, favicon, titles, spam comments.
• Before your next purchase or exchange: treat a high score as the start of a review, not the end.

If you want a second opinion that doesn't depend on one vendor's model, check any domain on Satelo. In about 30 seconds you get a 0–100 Quality Score with the evidence behind each component (popularity rank, age, crawl footprint, speed), so you can see why a site scores the way it does instead of guessing which of 27 signals fired.

FAQ

What is a good Moz Spam Score?

Moz classes 1%–30% as Low, 31%–60% as Medium and 61%–100% as High. Moz says you shouldn't be concerned about a Low or Medium score if your site has no penalties. Many small, legitimate sites sit in the Medium band.

Does Google use Moz Spam Score?

No. Spam Score is Moz's own machine learning model, built from Moz's crawl. Google's rules are set out in its spam policies, and problems Google acts on show up as manual actions in Search Console, not as a third-party percentage.

Why is my website's spam score high?

Usually because your site shares surface features with penalized sites: few pages, little traffic, a TLD or domain name pattern often used by spam, no contact details, no favicon or none of the common tracking tags. A sudden jump can also mean hacked pages or spam comments with outbound links.

How do I reduce the spam score of my website?

Fix the signals that also help readers: force HTTPS, add contact details and a favicon, clean up titles and meta descriptions, remove spam comments and odd outbound links, and keep publishing. Moz updates the score quarterly, so changes take time to show.

Should I disavow links with a high spam score?

Usually not. Moz says your own Spam Score does not depend on your backlinks, so disavowing won't lower it. Google says most sites don't need the disavow tool and suggests it mainly when spammy links have caused or are likely to cause a manual action.

Where can I check Moz Spam Score for free?

In Moz Link Explorer. At the time of writing Moz offers 10 free queries per month with a free Moz Community account, and Spam Score is shown alongside Domain Authority and link counts.

What does a Spam Score of “--” mean?

According to Moz, it means the site has not been evaluated for Spam Score yet. It is neither a zero nor a warning, and a score may appear after a later update.

Read next

GA4 for Bloggers: A Simple Setup for Small SitesGA4 for beginners who run a blog: install the tag, set up two key events, link Search Console and read the five reports that actually matter for a small site.

Impressions but No Clicks in Search Console: Why It Happens and What to DoGetting impressions but no clicks in Search Console? Check position bands, titles, query intent and AI impressions. A step-by-step fix with our own real data.

Referring Domains vs Backlinks: Which Number Should You Actually Read?Referring domains vs backlinks explained: what each number counts, why their ratio tells you more than either one, and how to read them in Search Console.

Semrush Authority Score Explained: What It Measures and How It Compares to DR and DASemrush Authority Score explained from Semrush's docs: the links, traffic and spam checks behind it, how it differs from DR and DA, and how to raise it fairly.