Our audit shows the numbers of errors, warnings and notices. View the complete list, source lines and code extracts in the official validator.

Browser check

  1. Open the W3C Nu HTML Checker.
  2. Choose validation by address and enter the complete canonical HTTPS URL.
  3. Click Check.
  4. Count Error and Warning; informational notices are not included in the price.
  5. If a Fatal Error appears, repair it first and validate again because the list may be incomplete.

For a complete review, test the home page, category, product or service, article and a page containing a form separately. This automatic service and its price cover the home page.

JSON API check

curl -sG "https://validator.w3.org/nu/" \
  --data-urlencode "doc=https://example.com/" \
  --data-urlencode "out=json"

Save the tested URL and a screenshot of the totals. There is no need to copy the full error list into our report.