Free Website Tools

Check an SSL certificate, DNS records, HTTP headers or open ports, or see how AI agents read your pages. Built by the team behind Testomato.

Security

Check your certificate, your security headers and the ports your server leaves open.

CSP Generator

Generate a Content Security Policy from your live site or a preset, with a security grade, config findings, and bypass detection.
Network Exposure Checker

See which ports and services your server exposes to the internet, and which of them deserve a second look.
SSL Certificate Checker

Check SSL certificate validity, expiry date, issuer, and certificate chain for any domain.

Look up DNS records, inspect HTTP responses and see how much downtime your SLA allows.

DNS Lookup

Look up DNS records (A, AAAA, CNAME, MX, TXT, NS) from multiple global server locations.
HTTP Response Inspector

Send an HTTP request with any custom headers and inspect the full response — status code, all response headers, and a body preview.
SLA Uptime Calculator

Convert any uptime percentage into allowed downtime per period, or check if an outage duration exceeded your SLA target.

See your pages the way search engines and AI agents read them.

Markdown for Agents Checker

Test whether your website serves Markdown via HTTP content negotiation — essential for AI agent readiness.
Website Content Extractor

Extract clean, structured content from any public webpage as JSON, HTML, plain text, Markdown, or a distraction-free reading view.
JSON-LD Schema Generator

Build Google-friendly structured data for Organization, Local Business, FAQ, Article, Product or Breadcrumb — and copy a ready-to-paste script tag.

You can try it all free for 14 days with no credit card and no commitment.