Free tool
Paste your page’s code and find the problems that hurt visitors and Google: unclosed tags, missing titles and descriptions, images without alt text, broken heading order and more.
Tip: open your website, right-click and choose View page source, then copy everything (Ctrl+A, Ctrl+C) and paste it here. Your code is checked in your browser and never sent anywhere.
This is a quick check of the problems that matter most for visitors and Google. For a full standards check, also run your page through the official W3C validator (validator.w3.org).
What it checks
Your code is checked in your browser and never sent anywhere.
Found lots to fix? We can redesign your site and show you a free preview first.
Free, with no sign-up. Bookmark this page (Ctrl+D, or ⌘+D on a Mac) to use it again anytime.
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