Website Uptime Checker

Paste the full URL (for example https://example.com) into the checker and it makes a live HTTP request to that address, reporting back whether the server responded. A green “Online” result with a 200 status code means the site is reachable; a 4xx, 5xx, or connection error means it is having problems. Because the request runs from an external server, it tells you if the site is genuinely down rather than just unreachable from your own network.

The status code is the server's response to the request: 200 means the page loaded fine, 301 or 302 means it redirected, 403/404 are client errors (forbidden or not found), and 500/502/503 are server errors. Anything in the 2xx range counts as online, while 4xx and 5xx codes signal the page is broken or unavailable even if the server itself answered. A failed connection with no code at all usually means the domain isn't resolving or the server isn't accepting requests.

Response time here is how long the server took to return the first response, measured in milliseconds. Under 500 ms is fast, 500-1500 ms is acceptable, and anything above 1500 ms is slow enough to hurt user experience and SEO. Note this measures server response only, not full page load with images and scripts, so a low number doesn't guarantee a fast-feeling page for visitors.

If the site redirects, the checker follows the chain and reports the final URL it landed on, which is why you might enter http:// and see https:// returned, or a non-www address resolve to www. This is useful for spotting unexpected or broken redirects, redirect loops, or a domain quietly pointing somewhere else. If the final URL matches what you typed, no redirect happened.

This tool runs a single check on demand, so it tells you the site's status at that exact moment but won't watch it for you. To catch outages as they happen you need continuous monitoring that pings the URL on a schedule. SiteGauge does this and alerts you by email, Slack, or webhook the moment a site goes down and again when it recovers, so you find out before your visitors do.