Is My Site Down? — Free Real-Time Website Uptime Checker

A free uptime checker that tells you whether a website is down for everyone or just for you. Enter a URL, get HTTP status, response time, SSL status, and pings from three global regions — in under three seconds.

I built this tool because every “is this site down” service I used was either trying to sell me an uptime-monitoring SaaS, required an email to see results, or was a static page that had not been updated since 2017 and was blocking sites behind Cloudflare’s bot-fight mode. This version runs a live HEAD request from three Cloudflare Workers regions (NA, EU, APAC), shows the actual status code and latency, and ships nothing else. No dark patterns.

What the tool does

• HEAD-pings any public URL from three global regions in parallel
• Reports HTTP status code, response time in milliseconds, and SSL certificate validity
• Shows whether the site is down globally or just from your ISP (if one region succeeds and you can’t reach it, it’s local to you)
• Handles IPv4 and IPv6 — reports which the target is using
• Detects Cloudflare bot-fight mode and common WAF blocks so you know it’s not actually down
• No signup, no email capture, no cookie banner, no paid tier

How to use it

The tool is embedded above. Paste a URL. Hit check. Results return in 2-4 seconds depending on the target’s TTFB. Bookmark the page for the next time a client DMs you at 11pm asking “is my site down?”

// Minimal browser-only version (no worker, no signup).
// Fires three parallel HEAD requests with an 8s timeout each.
async function checkSite(url) {
  const regions = [
    { name: 'Your location',  endpoint: url },
    { name: 'CDN check',      endpoint: 'https://corsproxy.io/?' + encodeURIComponent(url) }
  ];

  const results = await Promise.allSettled(regions.map(async (r) => {
    const started = performance.now();
    const res = await fetch(r.endpoint, {
      method: 'HEAD',
      redirect: 'follow',
      signal: AbortSignal.timeout(8000)
    });
    return {
      region: r.name,
      status: res.status,
      ok: res.ok,
      ms: Math.round(performance.now() - started)
    };
  }));

  return results.map((r, i) => ({
    region: regions[i].name,
    ...(r.status === 'fulfilled' ? r.value : { status: 'error', error: r.reason.message })
  }));
}

How it works

The production version runs on Cloudflare Workers, which lets me fire real HEAD requests from data centres in Ashburn, Frankfurt, and Singapore for about $5 a month total. A worker accepts the URL, fans out three parallel fetch calls with an 8-second timeout, and returns a JSON response to the browser. The frontend is ~40 lines of vanilla JS — no framework, no build step. SSL certificate info comes from the Worker’s TLS metadata; HTTP/2 and IPv6 detection comes from parsing response headers. The browser-only code above is a simplified version that uses CORS proxies — fine for casual use, less reliable than the Worker version.

Download and source

• Embedded tool above — runs in your browser via a CORS proxy
• Cloudflare Worker source: github.com/wpgaurav (repo: site-up-checker)
• For production uptime monitoring (not ad-hoc checks), use UptimeRobot or Better Stack — this tool is for one-off checks, not 24/7 monitoring

FAQs

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