| If you want to… | Use this tool |
|---|---|
| Domain age, registrar, expiry date, name servers & DNS records | Domain age checker |
| A, AAAA, CNAME, MX, NS, TXT, SOA & CAA records of any domain | Dns lookup |
| Is it down for everyone or just you? Check any site instantly | Website down checker |
| Validity, expiry date, issuer, domains & chain of any SSL certificate | Ssl checker |
| All response headers plus a security header grade (A+ to F) | Http headers checker |
| Find all websites hosted on the same IP or server | Reverse ip lookup |
| See your user agent or decode any UA string: browser, OS, device | User agent parser |
| Screen size, viewport, pixel ratio & browser capabilities | What is my screen resolution |
| Find out which CMS, framework, hosting and tools a site uses | Website technology checker |
| Check a domain’s email records: MX, SPF, DKIM, DMARC and BIMI | Spf checker |
| Check if an IP or domain is listed on 30+ spam blacklists (DNSBL) | Blacklist checker |
| Test if a URL is allowed or blocked for Googlebot and other bots | Robots.txt tester |
| See the total size of a web page and every script, style and image | Page size checker |
| Check status codes and redirects of up to 100 URLs at once | Bulk http status checker |
14 free tools
Free Website Tools
These free website tools help you check how any domain is set up. Look up DNS records, test SSL certificates, inspect HTTP headers and redirects, and see if a site is up. They are handy for site owners, developers and support teams.
Guide
Which website tools should you use?
Pick the tool that matches the job. Each one is free and works in your browser.
FAQ
Free Website Tools: common questions
Quick answers about our website tools.
What can I check with these website tools?
You can check DNS records, SSL certificate details, HTTP headers, redirect chains, domain age and whether a site is online. Each tool focuses on one job so results are quick.
Why does my website show "Not secure"?
Usually the SSL certificate is missing, expired or set up for a different domain. Use the SSL checker to see the exact problem and the expiry date.
How long do DNS changes take to show?
Most DNS changes show within minutes to a few hours, but some can take up to 48 hours because of caching. A DNS lookup shows what the internet sees right now.
Do I need to own the domain to check it?
No. DNS records, SSL certificates and HTTP headers are public, so you can check any website.
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