The HTML Structure Validator API allows you to analyze HTML content to detect structural issues, improper tags, and markup inconsistencies that may impact rendering or SEO performance.

It is ideal for developers and businesses looking to ensure their code is clean, standards-compliant, and optimized for better accessibility and indexing. The API helps identify and fix common HTML issues in real-world scenarios, serving as a reliable validation utility rather than a formal standards authority.

Try the HTML Structure Validator API in the API playground to validate and improve your HTML with a simple API call.

Validate HTML API

Website Intelligence

Validate HTML

Raw HTML content to validate for structured data (max 5,000,000 characters)