How to check whether a website responds

When a page won't open, the question is always the same: is the problem the site or me? This tool runs a quick test from your browser and shows whether the address responded or not. It's worth understanding how the test works, because it has limits and does not replace professional monitoring.

Type the address in the field, with or without https://. If you leave it out, the tool adds https:// by itself. Only http and https addresses are accepted.
Click "Check" or press Enter.
Wait a few seconds. The result appears in green ("Responded") or in red ("No response"). If the test does not finish within 10 seconds, the result is "No response".
When the site responds, the time until the response is shown in milliseconds.
The addresses you tested are kept in a history. Clicking one repeats the check, and the "Clear history" button erases everything.

What the check actually measures

For security, browsers do not let a page read another site's response without permission (a rule called CORS). That is why the first attempt, made directly from your browser, can only tell whether the connection to the server was established. "Responded" means the server accepted the connection. It does not mean the page opens without errors: a site returning a 404 or 500 error can still show up as "Responded" at this stage.

If the direct connection fails, the tool makes a second query through a public intermediary service (allorigins.win), which accesses the site on its own and reports the HTTP code it received. At this stage, the site counts as "Responded" only when the reported code exists and is below 500; server errors (500 or higher) and a missing code count as "No response".

In every case, the test starts from your browser and your network, and it may differ from the site's real status. Network or regional blocks, extensions, firewalls, or sites that refuse automated access can produce "No response" even though the site works for other visitors. For a more reliable diagnosis, confirm by opening the site on another network (such as mobile data) or on another device.

Practical examples

Does your site seem to be down? If you run a store or a blog, test the address before opening a ticket with your hosting provider. If it stays red after a few attempts, check the provider's dashboard.
Only you can't get in? If the tool says "Responded" but your browser won't open the page, the problem may be the cache, an error on the page itself, or a specific block. Try another network or a private window.
Bank, government agency or unstable service? During maintenance windows, official sites become unstable. Test two or three times a few minutes apart before drawing conclusions.

Tips

If the result looks odd, repeat the test: momentary network failures happen.
Compare with the Is Online tool to rule out that the problem is your own connection.
If everything points to the site being down, Down Detector can help you see whether other people are reporting the same problem.

Privacy and how it works

The check starts from your browser, which contacts the address you entered directly. Only if that attempt fails is the address sent to the intermediary service allorigins.win for the second query; this third-party service may log the request. The history of your latest checks (up to 20 entries stored, 10 shown) stays only in your browser's local storage and can be erased with the "Clear history" button. Do not use the tool with addresses that contain passwords or tokens. See the Privacy Policy.

Frequently asked questions

Why does the tool say "Responded" if the site has an error?

Because, in the direct attempt, it does not read the site's status code: it only knows that the server accepted the connection. Use the result as a clue, not as a guarantee that the page works.

Why does a well-known site show up as "No response"?

It may be a block on your network, a momentary instability, a timeout (10 seconds), or a site that refuses automated queries. Open the address directly to confirm.

What is the difference between "site is down" and "no internet"?

A site that is down is a problem on the site's server. No internet is a problem with your connection. If several sites fail at the same time, the likely cause is your connection.

How do I erase the history?

Use the "Clear history" button shown below the list. You can also clear the site's data in your browser settings.

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