23 Free SEO Chrome Extensions that Actually Work, Tested by the Experts

We tested the most recommended SEO extensions. This list shows you the 23 best free ones.

Learn how to use these tools to boost your SEO without spending money.

List of Tools in Full:

• SEOTesting
• Sprout SEO
• Grammarly
• Keyword Surfer
• Racoon SEO Link Checker
• Glimpse
• SimilarWeb
• Similar Sites
• Schema Builder
• View Rendered Source
• Link Redirect Trace
• SEO Search Simulator by NightWatch
• Detailed
• SEO Minion
• MozBar
• Link Grabber
• Hunter
• Siteimprove Accessibility Checker
• SEOQuake
• NoFollow
• Redirect Path
• META SEO Inspector
• Tag Assistant

SEOTesting : On-Page SEO Insights and GSC Data

The SEOTesting Chrome extension helps with daily tasks and on-page SEO.

Top features:

• Find the page’s top queries
• See easy-to-read graphs with clicks, impressions, average position, and CTR
• View current SEO tests
• Get quick access to SEOTesting reports

This gives you Google Search Console data while browsing. You don’t need to open the SEOTesting dashboard every time. That saves big time.

Free features available to everyone:

• Canonical URL detection
• Meta robots tag detection
• Page word count
• Link count (separates internal and external links)
• Image count and missing alt text check
• Document heading structure

The document structure feature helps confirm content and headings are correct.

Pro tip: Click on any heading to scroll to that element. Hover your mouse to highlight it.

Sprout SEO : Instant Technical and Content Audits

Sprout SEO turns your Google Chrome toolbar into an SEO toolkit with instant, page-level analysis and exportable data without switching tabs. You get actionable technical and content insights while browsing any site.

Here are some of the things that make this extension useful for SEO professionals:

• Shows live title & meta description analysis.
• Displays indexability, robots status, and canonical checks.
• Presents Core Web Vitals for the current page.
• Outlines headings (H1-H6) with audit warnings.
• Lists links with anchor text, HTTP status, and in-page highlighting.

The mix of technical checks, content insights, and SERP research tools makes Sprout SEO a go-to for quick auditing and sense checks, as well as content planning. Its export features are especially handy for briefs and hand-offs.

Grammarly : Reduce Writing Errors That Hurt Readability and Dwell Time

Grammarly offers a free browser extension which helps reduce writing errors.

Key features:

– A generous free plan with core grammar and spelling checks
– Ability to set a preferred tone for consistent writing
– Improves user experience, which can support better rankings
– Tailored suggestions that make the extension easy to use

Keyword Surfer : Search Volume and CPC Data Overlaid Directly on Google SERPs

Keyword Surfer shows search volume and CPC for keywords in the SERP.

They have search volume data for over 70 countries. This includes the USA, UK, Australia, France, and Germany.

SERP features:

• Shows estimated website traffic
• Displays words on the page
• Counts exact matches for the query
• Alerts you when Google rewrites page titles

The title rewrite feature is a game-changer. Google often changes title tags now.

The sidebar widget shows:

• Keyword ideas
• Similarity to current query
• Search volume for each keyword

Press the star to save keyword ideas to your clipboard.

Racoon SEO Link Checker : Audit Link Attributes, Noindex Tags, and Indexing Status

Racoon SEO Link Checker is a free extension. It helps you track and manage links in one browser window.

Find every link on a page. Check the health of each one. See if it’s indexed and has correct attributes.

Key features:

• Identify link attributes (dofollow, nofollow, sponsored)
• Detect noindex meta tags
• Check indexing status via X-Robots-Tag headers
• Confirm indexing in Google search results
• Scroll to detected links instantly
• Copy link details to clipboard
• Set domains to check or exclude
• Export reports to Google Sheets

This saves time on manual link checking. It makes link management more efficient.

Glimpse : Enhanced Google Trends With Search Volume for SEO Topic Discovery

Glimpse enriches your Google Trends experience.

Features include:

• Search volume data
• Interest trajectory (removes seasonality)
• Email alerts for tracking keywords
• Shows which channel mentions keywords most
• People Also Search For keywords
• Topic Map visualization

Key benefits:

• Helps you spot new trends before they go mainstream
• Supports becoming an authority on emerging topics while competition is still low
• Optional newsletter with 2 exponential trends per month, sent by email
• Free plan includes 10 searches per month once you create an account

SimilarWeb : Competitor Traffic Estimates and Channel Breakdown

SimilarWeb shows key website metrics instantly.

Metrics displayed:

• Monthly visitors
• Bounce rate
• Average visitor duration
• Global ranking
• Top visiting countries
• Traffic sources (search, direct, social, email, ads, referrals)

The extension is 100% free. You just need to join their contributor network. This means you share information about sites you visit with SimilarWeb.

Great for competitor research. Pair it with SimilarSites for deeper insights.

Similar Sites : Find Competing Domains

Similar Sites shows related websites to the one you’re viewing.

• Main use case: Quickly find competing websites for any site you’re viewing. You don’t have to rely on guesswork.

• Additional use cases:
  • Especially useful when you’re new to a niche and can’t confidently identify competitors
  • Helps SEO agencies research competitor sites for new clients

• Panel shows:
  • Similar sites
  • Estimated monthly visitors for those competitors
  • Their ranking within the category
• Requires signing up for the SimilarWeb contributor program

Schema Builder : Write, Test, and Validate Structured Data Without Editing JSON

Schema.dev created this extension. It helps you see a page’s markup.

The extension helps you:

• Write new schema markup for pages without editing raw JSON
• Validate existing schema implementations and surface errors
• Fix detected issues with minimal effort via a simple interface
• Test markup with one-button execution

Best suited for:

• Adding structured data to ecommerce product and category pages and shows markup requirements and recommendations during testing and deployment

View Rendered Source – Compare Raw HTML vs JavaScript-Rendered DOM for Crawl Issues

This extension shows how browsers render pages versus original source code.

Why SEOs use this extension:

• See what the DOM looks like (what search engines see)
• Catch rendering errors before Google indexes an improperly rendered version
• Prevent JavaScript-related issues such as missing titles and meta descriptions

Three code sections displayed:

• Raw: HTML source code from browser’s ‘View Source’
• Rendered: Page as rendered in current browser (includes JavaScript changes)
• Difference: Changes JavaScript made between raw and rendered source

Link Redirect Trace – Diagnose Redirect Chains, HTTP Status Codes, and Robots Blocks

Link Redirect Trace (LRT) helps diagnose and analyze redirect errors.

This extension differs from alternatives. It shows errors, how to fix them, and their impact on your site.

Features:

• Detects redirect loops for current pages
• Shows HTTP codes for each redirect
• Alerts if robots.txt blocks crawling
• Detects canonical tags
• Shows meta robots tags
• Displays raw HTTP header data

Everything is free. No account creation needed.

SEO Search Simulator by NightWatch – Check Rankings from Any Country Without a VPN

SEO Search Simulator simulates Google searches from different locations in real time.

How the tool is helpful:

• See how pages rank in different countries without using VPNs
• Remove personalized Google results for cleaner ranking checks
• Use as a quick alternative to logging into full rank tracker tools
• Check competitor rankings for specific queries
• Save frequent searches, which is handy when you reuse the same queries repeatedly

Detailed – Inspect Titles, Meta Tags, Canonicals, and Schema in a Single Panel

The Detailed SEO Extension helps with on-page SEO checks.

Overview section shows:

• Page title
• Meta description
• Canonical URL
• Robots tag and X-Robots tag
• Meta keywords
• Word count
• Page language from HTML

Detailed has shortcuts for robots.txt and XML sitemaps. But they guess where these files are located. If files don’t exist, shortcuts lead to 404 pages.

Other features:

• Page heading hierarchy
• Export page links
• Download page images
• View structured data (schema markup)
• Open Graph for social media

SEO Minion – SERP Previews, Broken Links, and On-Page Checks in One Extension

SEO Minion has many capabilities. The SERP preview function shows how title and meta description changes look in search results.

This prevents you from following SEO tool character recommendations that cut off titles and descriptions.

Everyday tasks:

• Find broken links
• Check page HTTP status codes
• Find internal links
• Verify if pages are indexable

On-page elements it finds:

• Word count
• Title and meta description (warns if too long)
• Canonical URL and meta robots tags
• Page headings
• Image count and missing ALT text
• Open Graph metadata

SERP widget shows:

• Total results on page
• Ads versus organic results
• Rich results like product listings or FAQ data

Bonus feature: Download People Also Ask (PAA) questions and answers as CSV files for research.

MozBar – Domain Authority, Page Authority, and Link Metrics on Every SERP Result

MozBar analyzes pages for free. It checks load time, canonicals, status codes, and markup.

In SERPs, this extension shows Moz’s popular metrics: Domain Authority (DA) and Page Authority (PA).

Free plan includes link metrics from 3 places:

• Page analysis by clicking the extension icon
• Exporting search results to CSV files
• Clicking “Link Analysis” text in SERP info boxes

Common use case: Link-building campaigns. See which top SERP results have the highest authority.

Link Grabber : Extract Every Link from a Page in One Click for Quick Audits

Link Grabber collects all links from HTML pages with one button click. It displays them in a list.

A great tool when Screaming Frog is unavailable. Perfect for quick checks. Copy links into spreadsheets for analysis.

Features:

• Group links by domain
• Hide duplicates
• Block domains to remove them from lists

Hunter – Find Verified Email Addresses for Link Building and Outreach Campaigns

Hunter’s browser extension finds email addresses on the web easily.

The free plan includes 25 searches per month. Enough for occasional use.

When Hunter finds email addresses on sites you visit, it lights up (turns orange). Stays gray when it doesn’t find any. The extension works in the background.

Click the extension icon. See a pop-up with known email addresses and URL sources where they were found.

Siteimprove Accessibility Checker – Spot Accessibility Barriers That Affect SEO and UX

The Siteimprove Accessibility Checker finds insights about website accessibility.

This tool lists all accessibility issues. Shows how often they happen on pages. It points to elements responsible for warnings.

The accessibility checker helps when advising potential clients. Show examples of how they can improve accessibility compliance.

Straightforward extension for improving web experiences for users with disabilities.

SEOQuake : On-Page Metrics, SERP Overlays, and Link Data All in One Free Toolbar

SEOQuake handles a wide range of SEO tasks for free.

Quick page diagnosis shows:

• Link numbers (internal, external, nofollow)
• Canonical tags
• Images without ALT text
• Robots.txt and XML sitemap detection
• Most used words or phrases and their density

Google SERP features:

• Info box below each result
• Shows indexed pages for domains
• Displays backlink numbers
• Export button on SERP left side

Also includes an ‘SEO bar’ for browsing with domain metrics.

NoFollow – Visually Highlight Nofollow, Sponsored, and UGC Links While Browsing

NoFollow highlights nofollow links on web pages with visual indicators.

This extension makes link analysis much faster. Instead of checking HTML code, you see nofollow links instantly.

Key features:

• Highlights nofollow links with red dotted borders
• Shows sponsored and UGC link attributes
• Works on any webpage automatically
• No setup required

Why it’s useful:

• Quick link audits for your site
• Competitor link analysis
• Verify your own link implementations
• Check if external links pass authority

Perfect for link builders who need to assess link value quickly. Also helps with internal link audits.

Redirect Path – Map Full Redirect Chains and Status Codes for Any URL You Visit

Redirect Path shows the complete redirect chain for any URL you visit.

When pages redirect multiple times, this extension maps the entire journey. You see every step and status code.

Features include:

• Visual redirect chain display
• HTTP status codes for each redirect
• Final destination URL
• Redirect type identification (301, 302, etc.)
• Error detection in redirect loops

Common use cases:

• Fix broken redirect chains
• Identify unnecessary redirects that slow page speed
• Verify 301 redirects work correctly
• Audit competitor redirect strategies

Essential for technical SEO audits. Helps prevent PageRank loss from poor redirects.

META SEO Inspector – View Meta Tags, Heading Hierarchy, and Open Graph Data at a Glance

META SEO Inspector displays meta tags, headings, and images in an organized format.

This extension gives you a quick on-page SEO overview without viewing source code.

What it shows:

• All meta tags (title, description, keywords)
• Heading structure (H1, H2, H3, etc.)
• Image information and alt text
• Canonical URLs
• Open Graph tags
• Twitter Card data

Visual indicators:

• Missing meta descriptions show in red
• Duplicate content warnings
• Proper heading hierarchy checks
• Image optimization alerts

Perfect for:

• Quick page audits
• Content optimization checks
• Social media tag verification
• Multi-page analysis

Saves time compared to manual source code inspection. Great for content creators and SEO beginners.

Tag Assistant – Verify and Debug Google Analytics, Ads, and Tag Manager Installations

Tag Assistant helps you install and troubleshoot Google tags on your website.

This official Google extension works with gtag.js and Google Tag Manager. It shows which Google tags are present on any page you visit.

Core features:

• Displays Google tags found on pages in a side panel
• Works with Google Analytics, Google Ads, and Tag Manager
• Shows tag presence instantly when you navigate to pages
• Connects to tagassistant.google.com for advanced debugging

Troubleshoot mode:

• Advanced debugging tool for detailed diagnostics
• Works within iframes and across entire sessions
• Helps validate, diagnose, and resolve implementation issues
• Session data available for review on Google’s platform

Perfect for:

• Verifying Google Analytics installation
• Checking Google Ads conversion tracking
• Debugging Tag Manager implementations
• Ensuring tags fire correctly across your site

Essential for any site using Google’s marketing and analytics tools. Helps ensure your SEO efforts get properly measured and tracked.

My Essential SEO Extension Setup

After years of testing, these five extensions form the core of my daily SEO workflow:

1. SEOTesting – Pulls Google Search Console data into your browsing context for on-page insights and tests
2. Grammarly – Improves readability and reduces writing errors that can hurt engagement
3. Keyword Surfer – Overlays search volume, CPC, and suggestions directly on Google SERPs
4. SimilarWeb – Provides instant traffic estimates and channel breakdowns for competitor research
5. Schema Builder – Lets you create, validate, and troubleshoot structured data without editing raw JSON

Start with these five. Add others based on your specific needs.

Final Thoughts

These 23 free extensions have transformed how I approach SEO work. They’ve helped me:

• Reduce SEO analysis time significantly
• Catch technical issues before they impact rankings
• Research competitors’ traffic and strategies more effectively
• Validate and troubleshoot structured data implementations without coding knowledge
• Build a professional-grade SEO toolkit at zero software cost

Remember: Extensions are just tools. They work best when you understand SEO fundamentals. Use them to enhance your knowledge, not replace it.

I regularly update this list as new extensions emerge and existing ones evolve. The SEO landscape changes fast. Your toolkit should adapt with it.