SEO tools
Free SEO Tools
Single-purpose checkers that run one part of the DomainLens audit against any URL. Each one explains what it tests and what the result does not prove.
Robots.txt Checker
Fetches the robots.txt file for the host you enter, reports whether it exists and whether it blocks every crawler, and reads the page-level robots directives alongside it.
Sitemap Validator
Looks for the sitemap the way a crawler does — the robots.txt declaration first, then the conventional locations — then confirms it parses as XML and counts the URLs inside it.
Canonical Tag Checker
Reads the canonical URL a page declares, then fetches that URL to confirm it resolves, is not redirected, and is not noindexed — the three ways a canonical silently becomes inert.
Schema Markup Validator
Parses the structured data on the page you enter, lists the schema.org types it finds, and flags blocks that fail to parse or are missing the properties their type requires.
Redirect Checker
Follows the URL you enter through every hop, reporting the status code at each step and the final destination — the detail a browser hides once the address bar settles.
Broken Link Checker
Fetches the page you enter, takes a sample of the internal links it points at, and requests each one — reporting the status code that comes back instead of the colour of the link.
Indexability Checker
Checks every signal that decides whether a page is allowed into the index — the status code, robots.txt access, meta robots, the X-Robots-Tag header, and the canonical.
DNS Checker
Queries the live DNS for the domain you enter and reports the records it publishes: the addresses it resolves to, where its mail goes, and whether the TXT records email authentication depends on are present.
WHOIS Lookup
Queries the registry over RDAP — the structured successor to classic WHOIS — and reports when the domain was registered, how old it is now, who the registrar is, and when the registration lapses.
Domain Age Checker
Enter a domain to find when it was registered, how old it is today, when it expires, and which registrar holds it. Domain age is context for a diagnosis, not a Google ranking factor.
SSL Checker
Opens a TLS connection to the host you enter and reports the certificate it presents — the issuer, the validity window, the days remaining, and the negotiated protocol version.
HTTP Headers Checker
Requests the URL you enter and reports what the server sends back in its headers — the security headers present, the caching policy, whether the response is compressed, and which HTTP version was negotiated.
Run a fresh DomainLens audit and use the report as your priority list.