Website Checker for Status, SSL, Speed and Security
Thirteen website checker tools that look at a live site from our server the moment you click: what it answers, where it redirects, how its certificate and headers hold up, how fast it loads and whether anyone has tampered with it. No sign-up, and they don't use your daily tasks.
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Website Checker: all 15 tools
Is it up, and where does it go?
Is It Down? tries DNS, the connection, the TLS handshake and the HTTP answer in turn and names the step that fails. The HTTP Status Code Checker tests one URL or a whole list as a browser, Googlebot, Baiduspider or Bingbot. The Redirect Checker follows up to 15 hops, catches loops and 302s that should be 301s, and checks that the http, https, www and non-www versions end on one address. The HTTP Header Checker lists every response header with a plain explanation.
Certificates and security
The SSL Certificate Checker covers trust, expiry, host names, the certificate chain and TLS versions. The Security Headers Checker grades HSTS, CSP and four more headers from A+ to F and gives the line to add for each gap. The Mixed Content Checker finds http:// files on HTTPS pages, and the Hacked Website Checker compares what a visitor, Baiduspider, Googlebot and a search visitor get, looking for spam words, hidden links and sneaky redirects.
Speed and delivery
The Website Speed Test times DNS, connection, TLS, first byte and download, then measures up to 80 scripts, styles and images on the page. The GZIP and Brotli Checker shows what each compression method saves, and the CDN Checker tells you whether a domain sits behind a CDN, and which one.
What a site is made of
The Website Technology Detector names the CMS, frameworks, analytics and server behind a site, and View Page Source shows the raw HTML with line numbers and search, on a phone too. Website Screenshot and Mobile-Friendly Test are coming soon. Every check runs on our server when you click, visits public addresses only and keeps no copy of the result.