The Ultimate SEO, Speed, and Security Optimizer
Swiftly identify and rectify SEO issues, speed bottlenecks, and security vulnerabilities, ensuring your website runs smoothly and ranks well.
Whether you're a developer, a digital marketer, or a small business owner, SEO Checker provides the tools to audit your website comprehensively, and ensure it aligns with best practices
What sets this extension apart from others
Perfect for Beginners
Read the built-in help and guidelines to find out why certain issues are problems and how to fix them.
Stop Wasting time in Manual testing
With just one click, SEO Checker can quickly and accurately analyze thousands of pages in minutes.
Reveal Hidden Issues
Identify critical problems on pages you might overlook using our advanced crawling capabilities and extensive testing suite.
Explore and Resolve Issues Quickly
Easily pinpoint problems using intuitive shortcuts to access a page's incoming links, view its source code & response headers.
Crawl only what you want
Crawl specific areas of interest within your site by setting limits on URLs based on subdomain, subfolder, crawl depth, & types.
Export to CSV
Easily export issues to a CSV file, allowing you or your team to conduct a detailed analysis on your own.
What SEO Checker checks
Every page is tested against 87 pass or fail checks in five categories, and 32 more data views let you dig into the crawl itself. Each check comes with a plain-language explanation of why it matters and how to fix it.
SEO: 48 checks
Titles, descriptions and headings that are missing, too long or duplicated. URLs, canonical tags, hreflang, redirects, broken links, thin and duplicate content, image alt text, robots.txt and the XML sitemap, including pages only the sitemap links to.
Speed: 15 checks
Compression, minification, inline code, render-blocking scripts, cache headers and lifetimes, duplicate resources and server response time. Third-party scripts you cannot change are left out of the score.
Security: 13 checks
HTTPS and HSTS, MIME types and content sniffing, clickjacking and XSS protection, hidden server information, and the Content-Security-Policy, Referrer-Policy and Permissions-Policy headers.
Accessibility: 6 checks
Page language, heading order, iframe titles, form labels, descriptive link and button text, and whether users can zoom the page.
AI readability: 5 checks
Whether your content is visible without JavaScript, carries structured data, uses plain HTML links, offers an llms.txt file and lets AI crawlers in.
Explore your site: 32 data views
Every crawled URL with its status code, response headers, inlinks, outlinks and redirect path, plus an internal link graph you can click through page by page.
How it works
Enter a URL
Type any address, set the crawl depth and URL limit if you want, and press Start. SEO Checker runs in your browser. There is no account to create and no API key to buy.
Let it crawl
Pages, images, scripts and stylesheets are fetched and checked as they arrive, up to 10,000 URLs per crawl. A site with 1,000 pages usually takes a few minutes.
Read the dashboard
Each category gets a score. Every failing check lists the affected pages with the values that caused the failure, and the AI audit summary tells you what to fix first.
Fix, export, compare
Export the results to Excel or CSV, print a PDF report with your own branding, or save the crawl and compare it with the next one to see what improved.
Crawling happens on your computer. The only data that leaves your browser is a compact summary of the audit results used to write the AI summary, and you can turn that off in the settings at any time.
SEO Checker in Action
