Free HTML Validator
Validate HTML markup online to check structure, find parsing issues, and review document quality before publishing. Paste your markup and test it instantly in the browser.
How to Use the HTML Validator
Paste your HTML markup into the editor and click Validate HTML. The tool checks the provided document structure and reports whether parsing issues were found. This is useful for reviewing snippets, landing pages, email markup, or generated template output before shipping it.
Key Features
- Quick browser-based validation for pasted HTML snippets
- Helpful for debugging malformed tags and broken structures
- Useful for page fragments, components, and full HTML documents
- No upload required because processing happens locally
- Simple result panel for fast review and iteration
Why Validate HTML?
Valid HTML improves maintainability, reduces rendering surprises, and helps ensure your markup is interpreted consistently across browsers. Developers commonly validate HTML when debugging templates, checking CMS output, or reviewing content generated by page builders and automation tools.