Website Uptime Checker

Quickly check whether a public website or API endpoint responds over HTTP or HTTPS. Enter a full URL or hostname to receive up/down status, HTTP status code, response time in milliseconds, and the final URL after redirects. Probes run from the ToolsLibrary server environment — useful for confirming outages, testing after deployments, or verifying that a URL returns 200 OK. A single snapshot, not continuous uptime monitoring or SLA reporting.

How to Use the Website Uptime Checker

Enter a URL or hostname to see whether it responds, the HTTP status code, latency, and final URL after redirects.

  1. Open Website Uptime Checker.
  2. Enter a full URL (https://example.com/page) or hostname (example.com).
  3. Click Check uptime to send an HTTP probe from the ToolsLibrary network API.
  4. Read the UP or DOWN badge on the result card.
  5. Note the HTTP status code and status text (for example 200 OK or 503 Service Unavailable).
  6. Check Latency in milliseconds and compare against your usual baseline.
  7. Review Final URL if redirects occurred — confirm they land on the expected HTTPS host.

How availability probes work

The server requests the URL with redirect following enabled, records time to first response, and classifies success vs failure. This validates that something answered on the network — not that page content is correct.

Worked example

  • Post-deploy smoke test — expect 200 OK and low latency on your production homepage.
  • API health — hit https://api.example.com/health and confirm 200 before announcing maintenance complete.
  • Redirect audit — http://example.com should show Final URL on https:// with UP status.

Common mistakes

  • Testing from localhost or staging URLs not reachable on the public internet.
  • Treating one failed probe as definitive — retry and check from another network.
  • Ignoring 403/401 — the server is up but rejecting unauthenticated probes.

Limitations

Single vantage point and timestamp. No content validation, SSL detail, or header analysis — use SSL Certificate Checker and HTTP Headers Checker for those layers.

FAQ

Where does the uptime check run from?

The HTTP request originates from the ToolsLibrary server-side network API. It reflects reachability from that location, not necessarily from your home or office network.

Should I enter http:// or https://?

Either works. If you omit a scheme, the probe still attempts a sensible HTTPS/HTTP fetch. Include the full URL when testing a specific path or API route.

What counts as UP vs DOWN?

UP generally means an HTTP response was received with a success-class status (typically 2xx). Errors, timeouts, and many 4xx/5xx codes mark the site as down for this check.

Why is latency different from Ping Test?

Uptime measures full HTTP response time including redirects and server processing. Ping Test uses lighter DoH requests or a minimal uptime probe with different timing.

Does it follow redirects?

Yes. Final URL shows where the request ended after redirects — helpful when http:// redirects to https:// or apex redirects to www.

Can I monitor uptime 24/7?

This tool performs one manual check per click. For ongoing monitoring use a dedicated uptime service with alerting.

Why does my site show DOWN but loads in my browser?

Geo-blocking, bot protection, IP allowlists, or WAF rules may block the probe IP while allowing your browser. Check server logs and firewall rules.

Can I check localhost?

No. The remote probe cannot reach 127.0.0.1 or private LAN addresses — only public internet URLs.

Are POST APIs supported?

The uptime endpoint performs GET-style availability checks. Complex API methods belong in API Request Tester or your own monitoring scripts.

Is repeated checking allowed?

Reasonable manual retries are fine. Do not hammer third-party sites with automated high-frequency requests without permission.