HTML Validator
NewValidate HTML structure for common errors, missing attributes, and accessibility issues.
Frequently Asked Questions
What does HTML Validator do?
The HTML Validator validate html structure for common errors, missing attributes, and accessibility issues. It automates repetitive HTML tasks to save developers time and reduce manual formatting errors.
How do I validate HTML code?
Paste your HTML into the input editor and click the action button. The tool processes your markup instantly and outputs the result in the adjacent panel, ready to copy back into your project.
Does HTML Validator preserve my formatting?
Yes. The tool intelligently preserves meaningful whitespace inside elements like <pre> and <textarea> while normalising indentation consistently across the rest of the document.
Can I preview the output?
Yes. A live preview pane renders the processed HTML in a sandboxed iframe so you can verify the visual result before copying the code into your project.
Is HTML Validator compatible with HTML5?
Yes. The tool fully supports the HTML5 specification including semantic elements, custom data attributes, and void elements. Legacy HTML4 attributes are also handled without errors.