Free tools to test speed, security, and site health
A practical set of free performance tools for diagnosing what's slowing your site down or putting it at risk - speed and Core Web Vitals, mobile readiness, security headers, broken links, redirects, and uptime. Get a scored report and prioritized fixes in seconds.
16 free performance tools
Website Down Checker
Is it down for everyone, or just you?
Check any site's status from an independent edge server - get a clear up/down verdict, the HTTP status code, response time, and a plain-English explanation. Free, no signup.
Free Website Grader
Score your whole site in seconds
Grade any website across performance, mobile, SEO, security, and AI readiness. Get a 0-100 score and prioritized fixes instantly - no email gate.
Website Tech Stack Checker
What is this site built with?
Detect the CMS, framework, ecommerce platform, analytics, CDN, and hosting behind any website. Free, no signup - a passive BuiltWith alternative.
Website Security Scanner
Is your website safe?
Run a free passive security scan of HTTPS, security headers, mixed content, cookie flags, and software exposure. Get a 0-100 score and prioritized fixes. No signup.
Responsive Design Checker
Preview any site at every screen size
Preview any website at real phone, tablet, laptop, and desktop sizes side by side to catch responsive layout issues. Free, runs in your browser.
Website Speed Test
Check your site performance in seconds
Enter any URL to get a scored performance report with Core Web Vitals, Lighthouse scores, and prioritized fixes - free, no signup.
Website Modernization Checker
Instant modernization score in 10 seconds
Enter your URL to scan for outdated design, missing mobile responsiveness, weak CTAs, and security issues - free, no signup.
Landing Page Grader
Grade your landing page in 10 seconds
Enter your landing page URL to get a scored conversion report across headlines, CTAs, trust signals, and technical checks - free, no signup.
Conversion Rate Benchmarker
Compare your rate against your industry
Enter your conversion rate, industry, and traffic source to see your percentile ranking, revenue gap, and top fixes - free, no signup.
Website Accessibility Checker
Find WCAG issues in seconds
Enter any URL to scan for common WCAG 2.1 accessibility issues across images, forms, navigation, color, and ARIA - with prioritized fixes. Free, no signup.
Website Carbon Calculator
How green is your website?
Enter any URL to calculate your website's carbon footprint per page view, see page weight breakdown, and get optimization tips - free, no signup.
Broken Link Checker
Find dead links on any page in seconds
Enter a URL to scan for broken links with status codes and anchor text - internal and external. Free, no signup.
SSL & Security Headers Checker
See if your site is properly hardened
Check your HTTPS setup and HTTP security headers (HSTS, CSP, X-Frame-Options) and get a graded report with fixes. Free, no signup.
Mobile-Friendly Test
Is your site ready for phones?
Enter any URL to check viewport, responsive layout, tap targets, fonts, and mobile performance - a free, no-signup replacement for Google's retired Mobile-Friendly Test.
Redirect & HTTP Status Checker
Trace 301/302 redirect chains
Follow every redirect hop for any URL, catch chains and loops, inspect status codes and headers, and get an SEO health score with fixes. Free, no signup.
Image Compressor & Optimizer
Shrink JPG, PNG & WebP images
Compress and convert JPG, PNG, and WebP images, set a target file size, and batch download - all in your browser, nothing uploaded. Free, no signup.
Why use these performance tools
Performance is where SEO, conversions, and trust meet. Slow pages lose rankings and revenue; missing security headers and broken links erode trust and crawlability. These tools let you scan any URL, see exactly what's wrong, and get the prioritized fixes that matter most - without an enterprise monitoring contract. Start with the Website Grader or Speed Test for the big picture, then drill into security, links, and redirects.
Performance Tools FAQ
Are these performance tools free?
Yes - all of them, with no signup. Scanning tools make a single request to the URL you enter and return a scored report you can act on immediately.
Which tool should I run first?
Start with the Free Website Grader or Website Speed Test for an overall picture, then use the security headers checker, broken link checker, and redirect checker to fix specific issues.
Do slow pages really hurt my rankings?
Yes. Core Web Vitals are a confirmed ranking signal, and slow pages also reduce conversions. The speed test reports your vitals and the highest-impact fixes to improve both.
How accurate are the security and speed scores?
They are designed to be directional and actionable - they surface real, fixable issues and prioritize them. They are not a substitute for a full penetration test or lab-grade performance audit.
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