HTML Validator

Validate HTML syntax and structure. Check for errors and warnings in your HTML code.

HTML Input

Upload




  Test


  
    Unclosed paragraph

<!DOCTYPE html>
<html>
<head>
  <title>Test</title>
</head>
<body>
  <div>
    <p>Unclosed paragraph
  </div>
</body>
</html>

How this HTML Validator works

The HTML Validator runs entirely in your browser using JavaScript. Unlike other tools that send your data to a server, we process everything locally on your device. This guarantees 100% privacy and blazing fast speed.

No server interaction – data never leaves your device
Instant results since there is no network latency
Works offline once the page is loaded
Free to use with no usage limits

How to Use

Input

Enter or paste your content into the input field.

Action

Click the primary button to generate or format.

Result

Copy your result immediately from the output box.

Frequently Asked Questions

Is this tool free?

Yes, this tool is 100% free to use for personal and commercial purposes.

Is my data safe?

Absolutely. All processing happens in your browser. We do not store or see your data.

Can I use this offline?

Yes, CodeItBro is a Progressive Web App (PWA). Once loaded, it works without internet.

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The HTML Validator is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.