MozBar is a free browser extension from Moz that gives you instant SEO metrics for any webpage you visit. It's one of the most popular SEO tools among marketers, and for good reason - it puts Domain Authority, Page Authority, and link data right at your fingertips.
Whether you're analyzing competitors, evaluating link prospects, or researching keywords, MozBar makes SEO research faster and more convenient. Here's everything you need to know about using it effectively.
What is MozBar?
MozBar is a browser extension available for Chrome and Firefox that displays SEO metrics directly in your browser. When activated, it shows a toolbar with key metrics for the current page, and it can also overlay metrics on Google search results.
The tool was created by Moz, one of the most respected companies in the SEO industry. While Moz offers premium tools, MozBar's basic features are completely free - you just need to create a free Moz account.
Key Features
Domain Authority (DA)
Domain Authority is Moz's proprietary metric that predicts how well a website will rank in search results. It's scored on a scale of 1-100, with higher scores indicating greater ranking potential. DA is calculated based on linking root domains, total links, and other factors.
Use it for: Quickly evaluating the strength of competitor websites or potential link sources.
Page Authority (PA)
Page Authority measures the ranking strength of a single page rather than the entire domain. Like DA, it's scored 1-100. A page can have high PA even on a lower DA domain if it has strong backlinks.
Use it for: Analyzing specific pages you're competing against in search results.
Link Metrics
MozBar shows the number of links pointing to a page and domain. The free version shows basic counts; premium shows more detailed link data including spam score.
Use it for: Understanding why certain pages rank and identifying link building opportunities.
SERP Overlay
When you search on Google, MozBar can display DA and PA for every result right on the search page. This lets you instantly assess the competition for any keyword.
Use it for: Keyword research and competitive analysis without leaving Google.
Page Analysis
Click the MozBar icon to see detailed on-page elements including title tag, meta description, H1/H2 headings, and other SEO-relevant HTML elements.
Use it for: Quickly auditing on-page SEO without viewing source code.
How to Install MozBar
- 1 Go to the Chrome Web Store (or Firefox Add-ons) and search for "MozBar" or visit Moz's website directly.
- 2 Click "Add to Chrome" (or equivalent for Firefox) to install the extension.
- 3 Create a free Moz account if you don't have one. You'll need to verify your email.
- 4 Log into MozBar by clicking the extension icon and entering your credentials.
- 5 Enable the toolbar by clicking the MozBar icon. A toolbar will appear below your browser's address bar.
Using MozBar for Keyword Research
One of MozBar's most powerful uses is evaluating keyword difficulty directly in Google search results. Here's how to use it:
- Search for your target keyword in Google
- Look at the DA and PA scores displayed under each result
- Evaluate the competition level based on these metrics
What the numbers tell you:
| DA Range | Competition Level | What It Means |
|---|---|---|
| 0-20 | Very Low | New or small sites. Easier to outrank. |
| 21-40 | Low to Medium | Growing sites. Competitive but achievable. |
| 41-60 | Medium to High | Established sites. Requires solid SEO. |
| 61-80 | High | Authority sites. Difficult to outrank. |
| 81-100 | Very High | Major brands/sites. Very difficult. |
Using MozBar for Competitive Analysis
MozBar makes competitor research fast and easy:
- Compare your DA to competitors: Visit competitor sites with MozBar enabled to see how your domain stacks up.
- Analyze top-ranking pages: For any keyword you want to rank for, check the PA of pages currently ranking. This tells you what you're up against.
- Find link opportunities: When researching sites for link building, quickly check their DA to prioritize high-authority targets.
- Evaluate content gaps: If competitors with lower DA are outranking you, their content or on-page SEO may be stronger.
Using MozBar for Link Building
When prospecting for backlinks, MozBar helps you quickly qualify opportunities:
- Prioritize high-DA sites: Links from higher DA sites generally pass more value.
- Check spam score: Premium MozBar shows spam score - avoid sites with high spam scores.
- Verify page relevance: Use the page analysis feature to ensure the linking page is topically relevant.
- Export data: Premium users can export SERP data to CSV for further analysis.
Free vs Premium MozBar
| Feature | Free | Premium (Moz Pro) |
|---|---|---|
| Domain Authority | Yes | Yes |
| Page Authority | Yes | Yes |
| SERP Overlay | Yes | Yes |
| Page Analysis | Yes | Yes |
| Spam Score | No | Yes |
| Detailed Link Metrics | Limited | Full |
| SERP Export | No | Yes |
| Keyword Difficulty | No | Yes |
| Monthly Price | $0 | $99+ (Moz Pro subscription) |
For most users, the free version provides plenty of value. Premium features are useful for agencies and professionals who need deeper data and export capabilities.
MozBar Limitations
While MozBar is incredibly useful, it has some limitations to keep in mind:
- DA is not a Google metric: Google doesn't use Domain Authority. It's Moz's own prediction based on their data.
- Data can be delayed: Moz updates their index regularly, but it may not reflect the most recent changes to a site.
- Free version has limits: You get a limited number of queries per month on the free plan.
- Can slow browsing: Running MozBar constantly can impact browser performance. Toggle it off when not needed.
- Not mobile-friendly: MozBar is a desktop browser extension only.
MozBar Alternatives
While MozBar is excellent, you might also consider these alternatives:
- Ahrefs SEO Toolbar: Shows Ahrefs metrics (DR, UR) instead of Moz metrics. Requires Ahrefs subscription.
- SEOquake: Free extension with metrics from multiple sources. More features but more complex.
- Ubersuggest Extension: Neil Patel's free tool with basic SEO metrics and keyword data.
- Keywords Everywhere: Focuses on keyword data rather than authority metrics. Affordable paid model.
Getting Started with MozBar
MozBar is one of those tools that becomes indispensable once you start using it. The free version gives you enough functionality to significantly improve your SEO research workflow.
Here's what I recommend:
- Install MozBar and create your free Moz account
- Practice using the SERP overlay on keywords you're targeting
- Get familiar with the page analysis features
- Use it consistently for a month before deciding if you need premium