ValidateHTML
Free HTML, CSS, JSON & XML validator with quality scores
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ValidateHTML - Free HTML, CSS, JSON & XML validator with quality scores

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12 free web validation tools in one place. Paste code or enter a URL, get instant results with a quality score (0-100). → HTML/CSS/JSON/XML Validators → Meta Tag & Open Graph Checkers → HTML Formatter (beautify + minify) → Robots.txt Analyzer & Page Size Checker Built for devs, SEO pros, and designers tired of W3C Validator's 2005 UX. No signup, no limits, 100% free.

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Hey! I'm a solo dev from France and I built this because I was always opening 5 or 6 different tabs to validate my code before deploying. W3C for HTML, jsonlint for JSON, some random site for meta tags... So I made one tool that does everything. The thing I'm most proud of is the Quality Score, you get a grade from 0 to 100 instantly so you know where you stand. It's completely free, no signup needed. Still early but I'd love to know what you think and what tools you'd want me to add!