Tool · Technical SEO
HTML Validator
Check a live page or pasted HTML against the W3C Nu Html Checker, the engine behind validator.w3.org. Results show each problem with its line number and the code around it.
Enter a URL or paste your HTML, then validate.
Your browser sends the URL or HTML straight to the W3C service, so nothing is processed on SeckRates servers. The W3C asks that its service be used reasonably, so avoid running many checks in a row.