Doctype Checker
The doctype at the top of an HTML document makes browsers use the current standards mode. The tool checks that it is present and which one is declared.
Checked by our server, free and without an account
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What the tool looks at
- Presence of the doctype declaration.
- The declared document type.
How it works
- Enter the address. Only public web addresses on the standard ports are accepted.
- Our server fetches what the check needs once, with its own honest bot name, and evaluates it.
- You get the evaluated values with a short explanation. Nothing from the page is stored.
More Technical tools
All tools- HTTP Headers LookupSee the HTTP response headers of any URL – status, caching, security headers and server details.
- Meta Charset CheckerCheck the character encoding of a page – declared in the HTML and set to UTF-8?
- Meta Viewport CheckerCheck the viewport meta tag of a page – required for a proper layout on phones and tablets.
- Meta Refresh CheckerFind meta refresh tags on a page – automatic reloads and redirects that confuse visitors and crawlers.
- Deprecated HTML Tags CheckerFind outdated HTML elements such as center, font or marquee on a page.
- Inline CSS CheckerCount inline style attributes on a page – they make the HTML heavier and harder to maintain.
- Website Reachability TestTest whether a website answers right now – status, connection time, TLS handshake and time to first byte.
The whole page in one audit
One audit runs more than 50 tests, rates them by severity and turns them into a score. Websites are re-checked on a schedule.