Free web performance tools
Check Core Web Vitals, diagnose speed issues, test AI visibility, and more. Instant results for any URL.
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Enter any URL to measure your Largest Contentful Paint score in seconds. Get the LCP element, render time, and specific fixes to improve your score.
Check your Cumulative Layout Shift score and identify exactly which elements are causing unexpected layout shifts on your pages.
Test your Interaction to Next Paint score and identify which interactions are causing responsiveness delays on your pages.
Measure your Time to First Byte from multiple global locations and identify server response bottlenecks affecting your Core Web Vitals.
Test all three Core Web Vitals — LCP, CLS, and INP — on any URL in one click. Get scores, element attribution, and specific fix recommendations.
Check your Google PageSpeed score for both mobile and desktop instantly. Get your Lighthouse performance score with specific optimisation recommendations.
Run a full Google Lighthouse audit on any URL without installing Chrome DevTools. Get performance, accessibility, SEO, and best practices scores.
Test your website loading speed and get a detailed performance breakdown with actionable recommendations to make your site faster.
Test your website's mobile performance with real mobile CPU throttling and 4G network simulation — exactly how Google measures mobile Core Web Vitals.
Check whether your website is optimised for AI search engines like ChatGPT, Perplexity, Claude, and Gemini. Get an AI visibility score with specific fix recommendations.
Generate a properly formatted llms.txt file for your website to improve visibility in AI search engines like ChatGPT, Perplexity, Claude, and Gemini.
Run a comprehensive technical SEO audit on any URL. Check Core Web Vitals, meta tags, canonical, structured data, robots.txt, and more in one click.
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Identify render-blocking CSS that is delaying your page's First Contentful Paint and Largest Contentful Paint scores.
Scan any page for unoptimised images that are inflating load time and LCP scores. Get specific recommendations for format, sizing, and lazy loading.
Identify web font loading issues causing CLS, LCP delays, and Flash of Unstyled Text (FOUT) on your pages.
Check whether your CDN is correctly serving assets, setting cache headers, and delivering content from edge locations close to your users.
Analyze the HTTP caching headers on any URL to verify Cache-Control, Expires, ETag, and Vary headers are configured correctly for optimal performance.
Identify every third-party script on your page, see how much each one costs in load time, and get recommendations to reduce their impact on Core Web Vitals.
Analyze the JavaScript on any page to identify large bundles, unused code, and script blocking issues causing LCP and INP regressions.
Check whether your server is serving Gzip or Brotli compressed assets to reduce transfer sizes and improve load times.
Inspect all HTTP response headers on any URL — including security headers, caching directives, server information, and performance-related headers.
Check any URL for redirect chains, loops, and unnecessary hops that add latency and dilute PageRank.
Analyse your page and generate the optimal resource hint tags (preload, prefetch, preconnect, dns-prefetch) to improve LCP and load performance.
Test whether any URL is blocked or allowed by your robots.txt file. Verify bot access rules are configured correctly for SEO and performance.
Validate your XML sitemap for errors, missing pages, and incorrect URLs. Ensure Google and other search engines can discover and index your site correctly.
Test your page's JSON-LD structured data and Schema.org markup for errors, warnings, and rich result eligibility.
Check all meta tags on any page — including title, description, Open Graph, Twitter Card, and canonical — for completeness and optimisation.
View historical Core Web Vitals field data from the Chrome UX Report (CrUX) for any URL or origin. See how your real-user LCP, CLS, and INP have changed over time.
Calculate the right performance budget for your site based on your target LCP, CLS, and INP scores and see how far you are from hitting your targets.
Identify every render-blocking JavaScript and CSS resource that is delaying your page's First Contentful Paint and Largest Contentful Paint.
Measure your server response time and identify whether TTFB issues stem from DNS, TCP, SSL, or server processing — and get specific recommendations.
Measure your First Contentful Paint time and identify which resources are delaying the first visible content on your page.
Check your page's Speed Index score to understand how quickly the visual content of your page loads for users.
Need continuous monitoring?
Free tools give you a snapshot. AuditJet monitors your site on a schedule, alerts you when scores regress, and quantifies the revenue impact.
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