Know when your site breaks.
Find out why.
Monitor uptime and diagnose SSL, DNS, redirects, HTTP issues, domain expiry and more. Free tools when you need them. Automatic monitoring when you don't.
Check anything. No signup required.
View all tools →Fast, free tools for the problems that keep websites from working.
Check status codes, response headers, caching, security headers and server configuration.
Try it →Check certificate validity, expiration, issuer, TLS configuration and certificate chain.
Try it →Follow every redirect and spot loops, broken hops and unnecessary chains.
Try it →See how your DNS resolves across servers around the world.
Try it →Check when a domain expires before it catches you by surprise.
Try it →Check email authentication and find missing or broken DNS records.
Try it →See exactly where a page's load time goes, from DNS to first byte.
Try it →See which AI crawlers and search engines your robots.txt lets in.
Try it →Grade your security headers and see exactly what to add.
Try it →Don't keep checking. Let Pinger watch it.
Add your sites once. Pinger monitors them around the clock and alerts you when something goes wrong.