Three checks, one clear answer
The checker runs the same troubleshooting steps a server administrator would, in order, and stops right where the problem starts.
DNS Resolution
Queries Google, Cloudflare and Quad9 directly and compares the results — catches DNS propagation issues and wrong records immediately.
SSL Certificate
Connects over TLS and checks expiry, hostname match and trust — the most common reason browsers show "Not Secure".
Server Response
Follows redirects and reports the final HTTP status, response time and whether a CDN like Cloudflare is in front of the server.
Website down — common questions
Still stuck after the checker runs? A server engineer can dig into the underlying cause.
This is almost always DNS propagation — different internet providers and DNS resolvers can briefly show different results after a DNS change. The checker above queries Google, Cloudflare and Quad9 directly and shows you if they disagree.
A 502 means the web server (or a proxy like Cloudflare or Nginx in front of it) received an invalid response from the application server behind it — often a crashed backend process, a timeout, or a misconfigured reverse proxy.
503 means the server is reachable but currently unable to handle the request, usually because it's overloaded, under maintenance, or a service like PHP-FPM or a database has stopped responding.
Run this checker — it queries multiple public DNS resolvers (Google, Cloudflare, Quad9) directly and shows you the IP address each one currently returns for your domain, side by side.
This usually means the SSL certificate has expired, doesn't match the domain name, or isn't trusted by browsers. The checker inspects the certificate directly and tells you which of these applies. See our SSL installation service if you need it fixed.
Yes, the Website Down Checker is completely free with no signup required. There's a small rate limit per visitor to keep the service fast for everyone.
Found a problem the checker can't fix for you?
Our engineers can jump in and fix DNS, SSL or server issues directly — 24/7, no long-term contract required.