Free Technical SEO Tools
Developer-grade SEO tools: check page size, detect mixed content, verify viewports and favicons, identify CMS and tech stacks, analyze links, and run Lighthouse audits.
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🛠️ Quick Page Audit Workflow
Combine technical SEO checks with a full page audit: check page size and resources, detect CMS and tech stack, verify mobile readiness, and analyze internal links — all in one guided workflow.
Start Quick Page Audit Workflow →Frequently Asked Questions
What is page size and why does it matter for SEO?
Page size includes the HTML, CSS, JS, images, and other resources loaded when someone visits your page. Larger pages load slower, hurting user experience and Core Web Vitals scores. Our Page Size Checker gives you a complete breakdown of page weight.
How do I find mixed content on my HTTPS site?
Mixed content occurs when an HTTPS page loads resources (images, scripts, stylesheets) over HTTP. Browsers flag this as insecure. Our Mixed Content Checker scans any page and lists every insecure resource so you can fix them.
How can I check if a site is mobile-friendly?
Start with our Mobile Viewport Checker to verify the viewport meta tag is present and correct. Then check your favicon with our Favicon Checker, and run a Lighthouse SEO Report for comprehensive mobile-friendliness and performance scores.
What CMS is a website using?
Our CMS Detector can identify over 20 content management systems including WordPress, Shopify, Wix, Squarespace, Drupal, and Joomla by analyzing page source code, headers, and common file paths.
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