What is Website Uptime Checker?
An uptime checker is a method of determining if a website is up and running and accessible. It makes an HTTP request to the target URL and returns the HTTP status code and response time.
Our Website Uptime Checker sends one query to determine whether a website is up and running and how quickly it responds. It can be helpful when making a quick check when something doesn't seem right.
How to Use the Website Uptime Checker
- Type a URL (e.g.
https://example.com) or domain name. - Click Check Uptime.
- See the status, HTTP status code, and response time.
Understanding the Results
- Online — The server responded with a 2xx or 3xx status code. The site can be accessed.
- Error — The server responded but contained an error (4xx and 5xx errors). The site is available, but returning errors.
- Offline — Server was unreachable. The site might be down, the DNS might be misconfigured or a firewall is blocking access.
- Response time — The time to/from our server to the target (RTT) in milliseconds. Lower is better.
Why is it important to check website uptime?
- Rapid diagnosis — Confirm if the problem is due to a web site or is universally affecting all users.
- Post deployment checks — Ensure site is accessible after changes or deployments.
- Performance monitoring — Measure response times over time and identify slowdowns as early as they can be detected as an outage.
- SSL verification — If the site fails the test, it may mean that it has an expired or misconfigured SSL certificate.
Privacy
Our tool makes one single HTTP request and provides the output. No URL, results or IP addresses are saved, logged or shared.
Frequently Asked Questions
Is this real-time monitoring?
No. It is an one-off check, rather than ongoing monitoring. If you're looking for continuous uptime checks, check out UptimeRobot or StatusCake, which send pings to your site at regular intervals.
Is the Website Uptime Checker free?
Yes. It is 100% free with no sign-up, no limits, and no captchas.
What causes the response to be different?
Response times may vary depending on the server load, network environment, caching provided by the CDN and the distance between our server and the target. This one check does not represent an average.
What does it mean to be "Offline"?
"Offline" indicates that the tool was unable to connect to the server. This may be because the server is down, the DNS information was not able to be resolved, the firewall is blocking the connection, or the URL is incorrect.