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Monitoring Tools

Website Uptime Checker

Send a live request to any website from your own browser to confirm it's reachable and measure the real round-trip response time. Useful for developers and website owners.

How it works: browsers restrict cross-origin requests for security, so this tool confirms whether a site responds and how fast — the exact HTTP status code can't be read for third-party domains. Every check runs entirely on your device; nothing is sent to our servers.

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Check Website Status

Website URL

Timeout (ms)

Auto Refresh

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Bulk URL Check

Enter multiple URLs (one per line)

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Recent Checks

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No checks yet

Start checking websites above

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Features

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Real-time Monitoring

Instant status checks with response times

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Uptime Statistics

Track availability and performance metrics

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Bulk Checking

Check multiple websites simultaneously

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Auto Refresh

Continuous monitoring with customizable intervals

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Demo Environment

This tool runs in a demo environment with simulated responses.

For production monitoring, integrate with real uptime monitoring services or use server-side implementations.

URLs containing 'down', 'timeout', or 'broken' will simulate failures for testing.

Overview

Check whether any website is up — live from your browser

The Website Uptime Checker sends a live request to any URL straight from your browser and reports whether the site responds and how long it takes. It is handy for quickly confirming that a site you own or depend on is reachable, spotting slow response times, or sanity-checking a deployment — without installing a monitoring agent or creating an account.

Because browsers restrict cross-origin requests for security, the tool uses a no-cors request: if the site answers, it is marked reachable and the real round-trip latency is shown; if the request fails or times out, it is marked down. The exact HTTP status code cannot be read for third-party domains — that is a browser limitation, and the tool is honest about it rather than inventing a number.

100% freeNo sign-upRuns in your browserSingle & bulk checks

How to use it

1Enter a website URL (https:// is added automatically if you omit it).
2Optionally set a timeout, then click Check Status to run a single check.
3Read the result: status (up / down / timeout), measured response time, and timestamp.
4Use the Bulk URL Check box to paste many URLs (one per line) and test them together.
5Turn on Auto Refresh to re-check a URL on an interval and build a short uptime history.

Key features

Live reachability check performed from your own browser

Real round-trip response-time measurement

Single-URL and bulk (multi-URL) checking

Auto-refresh at 10s, 30s, 1m or 5m intervals

Running history with uptime percentage and average response time

Honest about browser/CORS limits — no fabricated status codes

Frequently asked questions

Is the uptime checker free?

Yes — it is completely free with no sign-up, and every check runs locally in your browser.

Why can't it show the exact HTTP status code?

Browser security (CORS) prevents reading the response of a cross-origin request. The tool can confirm whether a site responds and how fast, but the precise status code of a third-party domain is not accessible from client-side JavaScript.

What does 'down' actually mean here?

It means the request failed (for example DNS failure, connection refused, or your own device being offline) or exceeded the timeout. A reachable server that returns an error page may still be reported as up, because the request itself succeeded.

Can I monitor several sites at once?

Yes. Paste multiple URLs into the Bulk URL Check box (one per line) to test them in one go, and use Auto Refresh to keep an eye on a site over time.

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Full Guide Available