Analyze &
optimize.

Free Open Graph checker — validate og:title, og:image, and og:description tags instantly. Preview how your page appears on Facebook, LinkedIn, Twitter, and Slack.

Free HTTP status checker — test any URL and see the exact response code (200, 301, 404, 500, etc.). Check if a website is up or down in seconds.

Verify Google Analytics (GA4/Universal) installation and tracking.

Free Core Web Vitals checker — test LCP, CLS, and INP scores for any URL. Get specific recommendations to improve your Google page experience signals.

Free PageSpeed Insights tool — analyze mobile and desktop performance scores. Get Lighthouse-powered recommendations to speed up your website loading times.

Preview how your page will appear in Google search results.

Check if your pages are indexed by Google search engine.

Free OG image generator — create perfectly sized 1200x630 social media preview images for Facebook, LinkedIn, and Twitter. No design skills needed.

Free multi-page SEO audit — crawl your entire website and get a comprehensive report with scores, page-by-page issues, and actionable recommendations.

Free redirect chain checker — trace the full redirect path for any URL. Find 301/302 chains, loops, and unnecessary hops that slow crawling and hurt SEO.

Free compression checker — verify Gzip or Brotli compression is enabled. Uncompressed pages load slower and waste bandwidth. Test any URL instantly.

Analyze the total size of your web page including all resources.

Free canonical URL checker — verify canonical tags are set correctly across your pages. Detect conflicts, missing canonicals, and indexation issues.

Analyze and optimize your page title tags for SEO.

Check and optimize meta descriptions for better search results.

Analyze heading structure (H1-H6) for better SEO.

Free keyword density checker — analyze keyword usage and distribution across any page. Avoid over-optimization and find natural keyword placement opportunities.

Free robots.txt tester — check if search engines can crawl your pages. Validate syntax, test specific URLs against your rules, and fix crawl blocks.

Free XML sitemap checker — validate your sitemap structure, check for broken URLs, and verify all important pages are included. Works with sitemap indexes too.

Find and fix deprecated HTML tags that may affect SEO.

Check if your URLs are optimized for search engines.

Check for missing or poor alt text on images.

Check if images are optimized for responsive design.

Free favicon checker — verify your site's favicon is properly configured across browsers and devices. Check sizes, formats, and manifest.json entries.

Analyze content length for SEO optimization.

Check if HTTP URLs properly redirect to HTTPS.

Check for noindex meta tags that prevent indexing.

Check X-Robots-Tag HTTP headers.

Check if www and non-www versions redirect properly.

Free lazy loading checker — verify images and iframes use lazy loading correctly. Improve page speed by deferring offscreen content loading.

Free schema markup validator — test JSON-LD, Microdata, and RDFa structured data. Identify errors, warnings, and missing fields. Improve your rich snippet eligibility.

Free SSL certificate checker — verify certificate validity, expiration date, chain of trust, and protocol support. Catch SSL issues before they break your site.

Free mobile-friendly checker — test how your website performs on mobile devices. Check responsive design, tap targets, font sizes, and viewport configuration.

Free meta tag analyzer — check title tags, meta descriptions, Open Graph, and Twitter Cards in one scan. Get actionable SEO recommendations for any URL.

Free Twitter Card validator — test how your links appear on Twitter/X. Check card type, image, title, and description. Fix issues before you tweet.

Free hreflang tag checker — validate international SEO tags across your site. Detect missing return links, invalid language codes, and conflicting hreflang entries.

Free doctype checker — verify your HTML document type declaration is valid and correctly placed. Ensure proper rendering mode across all browsers.

Free resource hints checker — validate preload, prefetch, preconnect, and dns-prefetch tags. Optimize how your browser prioritizes resource loading.

Free HTTP/2 checker — test if your website supports HTTP/2 or HTTP/3. Faster protocols mean better load times. Check server protocol support in seconds.

Free security headers checker — test for CSP, HSTS, X-Frame-Options, and more. See which headers are missing and get implementation recommendations.

Free mixed content checker — find HTTP resources on HTTPS pages. Mixed content triggers browser warnings and hurts user trust. Scan any URL instantly.

Free DNS lookup tool — query A, AAAA, CNAME, MX, TXT, NS, and SOA records for any domain. Fast, accurate DNS resolution from multiple nameservers.

Free WHOIS lookup — check domain registration details, expiration dates, registrar info, and nameservers. Verify domain ownership for any .com, .net, or .org.

Free DNS propagation checker — test DNS records from 20+ global locations. See if your DNS changes have propagated worldwide after domain or hosting updates.

Free HTTP headers checker — inspect all response headers for any URL. Check cache-control, content-type, server info, and custom headers returned by your site.

Free accessibility checker — test your website against WCAG guidelines. Identify color contrast issues, missing alt text, ARIA problems, and keyboard navigation gaps.

Free website technology checker — detect CMS, frameworks, analytics tools, CDNs, and hosting providers used by any website. Powered by Wappalyzer signatures.

Free website carbon footprint checker — estimate the CO2 emissions per page view. See how your site's energy usage compares and get tips to build a greener web.

Free link analyzer — scan any page for internal and external links. Check for broken links, nofollow attributes, anchor text distribution, and orphan pages.

Free structured data tester — validate JSON-LD, Microdata, and RDFa on any URL. Check for schema.org compliance, required fields, and Google rich result eligibility.

Free AI visibility checker — test how your website appears to AI models and chatbots. Check if your content is accessible and properly structured for AI discovery.

Free crawlability checker — test if search engine bots can access and crawl your pages. Identify blocking issues, noindex directives, and crawl budget problems.

Free SEO checker — run a comprehensive SEO audit on any URL. Analyze on-page factors, technical SEO, content quality, and get a prioritized list of improvements.