Free Website Uptime Checker
Instantly check if any website is up or down — see response time, HTTP status code, and SSL status in seconds
How to Check Website Uptime — Free Uptime Checker
This free website uptime checker lets you instantly verify whether any site is up or down right now. Enter any URL and get results in seconds: live status, response time in milliseconds, HTTP status code, and SSL/HTTPS validity — no account or signup required.
What does this uptime checker measure?
- Availability: Whether the website responds to HTTP requests from our servers
- Response Time: How fast the server responds, measured in milliseconds (ms)
- HTTP Status Code: The server's response code: 200 OK, 301 redirect, 404 not found, 500 server error, etc.
- SSL/HTTPS: Whether the site uses a valid, active HTTPS/TLS connection
Why does website uptime matter?
Every minute your website is down costs you visitors, revenue, and trust. Even a few seconds of slow response time increases bounce rates. Studies show that 1 second of delay reduces conversions by up to 7%. Knowing your site is down before your customers do is critical — that's why continuous uptime monitoring exists. This free tool gives you a one-time snapshot; for 24/7 automated alerts, use AlertSleep.
Frequently Asked Questions
What is website uptime?
Website uptime is the percentage of time your site is accessible and responding correctly to requests. A 99.9% uptime means roughly 8.7 hours of downtime per year. Most hosting providers guarantee between 99.9% and 99.99% uptime in their SLA.
How do I check if a website is down for everyone or just me?
Use this free uptime checker — it pings the URL from our external servers, so if the site shows as offline here, it is down for everyone, not just your network or browser. If it shows online but you can't access it, the issue is likely local (your ISP, DNS, or VPN).
What does the HTTP status code mean?
HTTP status codes indicate the server's response: 200 means the site is up and OK, 301/302 means a redirect, 403 means access forbidden, 404 means page not found, 500/502/503 means a server error. Anything in the 2xx range means the site is working correctly.
What is a good website response time?
Under 200ms is excellent, 200–500ms is good, 500ms–1s is acceptable, and over 1 second indicates a potential problem. Google's Core Web Vitals recommend a Time to First Byte (TTFB) under 800ms. Slow response times hurt both user experience and SEO rankings.
How do I monitor my website uptime for free?
This tool gives you a free on-demand check. For free automated uptime monitoring with alerts, sign up for AlertSleep's free plan — it monitors up to 5 websites every 5 minutes and sends instant notifications via email when your site goes down.
Why is response time important?
Fast response times (under 200ms) provide better user experience and improve SEO. Slow responses can indicate server overload, database issues, or hosting problems.
How often should I check my website uptime?
For manual checks, daily is sufficient. For production websites, we recommend automated monitoring every 1–5 minutes. AlertSleep monitors your site around the clock and alerts you within seconds of any downtime.
What if my website shows as offline?
First, try accessing it from a different browser or device. If this checker confirms it's down, check your hosting control panel for server errors, verify your domain's DNS settings are correct, and contact your hosting provider.
What is the difference between an uptime checker and uptime monitoring?
An uptime checker (like this tool) performs a single, manual check on demand. Uptime monitoring is a continuous, automated service that checks your site every few minutes 24/7 and sends instant alerts when downtime is detected. AlertSleep offers both.
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