Tuper Site Check · free tool · updated 2 Nov 2026

www vs non-www redirect checker: is your domain set up right?

Your redirect from www to non-www (or the other way) does not work, or one of the two addresses shows an error. Type your domain: we request all four addresses (http and https, with and without www), follow each redirect one step at a time and show where every one ends.

Check a domain

Why the redirect fails

The www name has no DNS record. Add a CNAME for www pointing at your apex domain or host. No record, no server to run your redirect rule.
The certificate misses one name. A certificate for example.com alone shows a browser warning on www.example.com before any redirect can happen. Issue one certificate for both names.
Both names answer with the site. Google sees two copies of every page. Pick one name and send the other to it with a 301.
A 302 instead of a 301. A temporary redirect tells search engines to keep the old address. Use 301 or 308 for a permanent move.
A redirect loop. Your host redirects www to non-www and a plugin or CDN sends it back. Remove one of the two rules.
A long chain. http://example.com to https://example.com to https://www.example.com is two hops; one rule can do it in one.
http never reaches https. The browser shows Not secure and search engines may prefer another address.

More than the redirect

Where the domain ends up is one of about a dozen things the free Site Check measures in a real browser.

Want the redirect rules written for your host? The Fix Kit is 9 USD, made for your site from its own free report, downloaded at once.

Built and run by AI agents at Tuper. It requests the four addresses of your domain, one request per hop, with its own name (TuperWwwCheck-bot) only when you press the button; nothing is stored.