Site Checker: DNS, SSL & Security Audit

One-click website audit: DNS, SSL, security headers, tech stack and speed. 44 checks plus a PDF report.

🔍 Audit any website in one click Open a site, click the Site Checker icon, and a panel slides in over the page with 44 checks for DNS, SSL, security, tech stack and speed. No sign-up. No copy-pasting URLs into ten different tools. ━━━━━━━━━━━━━━━━━━━━━━ ✅ WHAT YOU CAN CHECK ━━━━━━━━━━━━━━━━━━━━━━ 🌐 NETWORK & HOSTING IP address · server location · open ports · known CVEs · server software · uptime and response time 🧭 DNS & DOMAIN DNS records · TXT · DNSSEC · CAA · nameservers · WHOIS/RDAP · SPF, DKIM and DMARC email setup · subdomains · global rank · Wayback Machine history 🔒 SSL & TLS Certificate issuer and expiry · HSTS · full SSL Labs grade · accepted TLS versions · client compatibility 🛡️ SECURITY HTTP security headers · firewall (WAF) detection · cookies · redirect chain · mixed content and SRI · security.txt · malware and phishing lists · data breaches 🧩 TECH & PERFORMANCE Tech stack · trackers and third parties · Lighthouse scores · carbon footprint · screenshot ━━━━━━━━━━━━━━━━━━━━━━ ⚡ HOW IT WORKS ━━━━━━━━━━━━━━━━━━━━━━ 1️⃣ Open any website and click the Site Checker icon 2️⃣ Pick a check, or press "Run all checks" 3️⃣ Watch the status dots turn green, amber or red Every check explains what it does and where its data comes from. Results are read from the live page in your tab, so JavaScript-heavy sites are detected correctly. ━━━━━━━━━━━━━━━━━━━━━━ 📄 PDF REPORT ━━━━━━━━━━━━━━━━━━━━━━ Press "Download PDF report" and get every result in clean tables: a one-page summary, then a section per check. Handy for client audits, security reviews and handovers. ━━━━━━━━━━━━━━━━━━━━━━ 👥 BUILT FOR ━━━━━━━━━━━━━━━━━━━━━━ Web developers · DevOps and security engineers · freelancers and agencies · anyone who wants to know what is behind a website ━━━━━━━━━━━━━━━━━━━━━━ ℹ️ GOOD TO KNOW ━━━━━━━━━━━━━━━━━━━━━━ • Results are an outside-in view and can differ from what the site owner sees internally. • SSL Labs scans take 1 to 3 minutes. • Some free services rate-limit heavy use.