When you’re researching websites, building backlinks, or analysing competitors, switching between multiple SEO tools can slow you down. That’s where MozBar helps.
MozBar is a free Chrome extension that displays important SEO metrics, such as Domain Authority (DA), Page Authority (PA), link data, and on-page SEO elements, directly in your browser. Instead of opening separate tools, you can evaluate any webpage or Google search result in seconds.
In this guide, you’ll learn what MozBar is, how it works, what metrics it shows, and how to use it for link building, competitor research, and everyday SEO tasks. Whether you’re new to SEO or already managing campaigns, MozBar can help you make faster and better-informed decisions.
What Metrics Does MozBar Show?
MozBar shows six data points in your browser without opening a separate tool. Each one answers a different question about a site’s authority, link profile, and on-page structure:
Domain Authority
MozBar domain authority scores the overall link strength of a website from 1 to 100 on a logarithmic scale. Moving from DA 20 to DA 30 takes far less effort than moving from DA 60 to DA 70.
DA is a relative metric. A DA 35 site in a niche where competitors average DA 20 is the dominant site in that space. Compare against your specific SERP. Here is how the ranges break down:
| DA Range | What It Signals |
| 1–30 | New or thin link profile. Low competition targets. |
| 31–50 | Credible site. Mid-tier competition. |
| 51–70 | Strong link profile. High competition in most niches. |
| 70+ | Authority site. Difficult to displace from rankings. |
Page Authority
Page Authority measures the link strength of one specific page. A DA 30 site can have PA 55 pages if strong external backlinks point directly to them.
A guest post on a DA 60 site on a PA 8 page passes less equity than a link on a DA 40 site on a PA 45 resource page with 30 referring domains. The domain score is not what passes equity. The page score is. Always check the PA of the specific linking page before deciding whether the opportunity is worth pursuing.
Spam Score
Spam Score flags how likely a site is to carry a toxic link profile. MozBar Premium only. Before filtering any prospect out, check the ranges:
- 1–30%: Low risk. Safe to pursue.
- 31–60%: Medium risk. Review manually before outreach.
- 61–100%: High risk. Avoid for link building.
Spam Score has false positives. Directories, news aggregators, and forums sometimes score high despite being legitimate. If a site scores above 40%, check whether it has real editorial content, named authors, and an active publishing history before dismissing it.
Link Metrics and Anchor Text Data
MozBar colour-codes every link on any page you visit. Turn this on before evaluating any prospect:
- Green: Followed external. Passes equity.
- Orange: No-followed external. Does not pass equity.
- Blue: Followed internal.
- Grey: No-followed internal.
If every outbound link on a site is orange, a guest post there passes no equity regardless of DA.
On-Page Elements and HTTP Status
Click Page Analysis to see title tag, meta description, H1–H3 structure, HTTP status, schema markup, and canonical tag. A first-pass audit in under 30 seconds without opening a crawl tool.
How to Install MozBar
The MozBar Chrome extension takes under two minutes to set up. You do not need a paid account to start using the core metrics:
- Search “MozBar” in the Chrome Web Store or visit moz.com/products/pro/seo-toolbar
- Click “Add to Chrome” and confirm
- Create a free Moz community account and sign in
DA, PA, link highlights, and on-page elements are free. Spam Score and keyword data require Moz Pro. Here is exactly what each plan includes:
| Feature | Free | Premium |
| Domain Authority | Yes | Yes |
| Page Authority | Yes | Yes |
| Link highlights | Yes | Yes |
| On-page elements | Yes | Yes |
| Spam Score | No | Yes |
| Keyword difficulty | No | Yes |
| Page optimisation | No | Yes |
How Does MozBar Work?
MozBar pulls data from Moz’s own web index. Before trusting any score, understand how that data is built and where it has gaps:
- Moz crawls independently from Google. Strong DA does not guarantee strong rankings. A high-DA site with thin content can rank below a DA 25 site with strong topical authority.
- Coverage is not complete. Links from smaller or newer sites may not appear in Moz’s index. A site earning links from niche publications may show a lower DA than its actual strength.
- Scores update on a crawl cycle. Recent link gains take three to six weeks to appear. Do not rely on a stale DA score for a site that has visibly grown its link profile.
How to Use MozBar for Link Building
Link building is where MozBar saves the most time. Run these four checks in order before adding any site to an outreach list:
Evaluating Prospect Sites Before Outreach
Three checks before contacting any site:
- DA above your minimum threshold; DA 30 is a standard floor for most campaigns
- Spam Score below 30%; between 30 and 60, check manually
- Outbound links are followed, not no-followed
This takes under 60 seconds per site and removes the majority of low-value prospects before any time is spent on email.
Checking DA and PA of Linking Pages
Check PA of the specific page carrying your link. Also check how many outbound links already exist on that page. A PA 45 page with three outbound links passes more equity per link than a PA 45 page with 45 outbound links. Link equity divides across every outbound link on the page.
Identifying Spam Score Risk
Run spam score checks across your full prospect list before outreach. A link from a 70%+ spam score site can damage your profile even if the DA looks clean. For sites between 31 and 60%, check manually: real content, named authors, legitimate backlinks, and consistent publishing history. If all four apply, it is a false positive.
Analysing SERP Results in Bulk
With MozBar active, every Google result shows DA, PA, and link count inline. Use this to:
- Find keywords where top-ranking pages have weak PA despite strong domain DA; these are displacement opportunities
- Spot ranking pages with no schema where your result could display more prominently even at a lower position
- Gauge whether a keyword is worth targeting before spending time on content
How to Use MozBar for Competitive Research
You can audit a competitor’s full SEO profile in under a minute without leaving the page. Open any competitor URL with MozBar active and check:
- DA gap: If they are more than 20 DA points above you, close the link gap before targeting the same keywords.
- PA on key pages: Low PA on a high-DA site means those pages rank on domain authority alone. They are more vulnerable to displacement.
- Outbound link highlights: Sites your competitors link to are warm outreach prospects for your own link building.
- Page Analysis tab: Weak H1, title tag, or missing schema on a ranking page is an on-page gap you can exploit.
MozBar Limitations: When Not to Trust the Data
These four limitations determine when the data is reliable enough to act on and when it needs verification:
- DA is not Google’s signal. Use it to filter, never to predict rankings.
- Index lag is real. Fast-growing sites may show a DA 10 to 15 points below their current strength. Verify through Ahrefs or Semrush before a final decision.
- Spam Score is probabilistic. It only flags risk patterns. Always verify manually above 40%.
- Free version has a critical gap. Without Spam Score, link prospecting decisions are incomplete.
Conclusion
MozBar is the fastest first-pass filter in a link builder’s workflow. Install it free and use it for three things:
- Filter outreach prospects by DA, PA, and spam score
- Read SERP competition before deciding whether a keyword is worth targeting
- Audit competitor on-page structure without opening a separate tool
For deeper analysis, use Moz Pro, Ahrefs, or Semrush.
