Free Monitoring Tools
Quick, free utilities to diagnose your website. No sign-up required.
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SSL Certificate Checker
Check SSL certificate validity, expiry date, issuer, and certificate chain for any domain.
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DNS Lookup
Look up DNS records (A, AAAA, CNAME, MX, TXT, NS) from multiple global server locations.
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Markdown for Agents Checker
Test whether your website serves Markdown via HTTP content negotiation — essential for AI agent readiness.
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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.
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SLA Uptime Calculator
Convert any uptime percentage into allowed downtime per period, or check if an outage duration exceeded your SLA target.
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Website Content Extractor
Extract clean, structured content from any public webpage as JSON, HTML, plain text, Markdown, or a distraction-free reading view.
Start monitoring your website content and uptime with Testomato
You can try it all free for 14 days with no credit card and no commitment.