SchemaCheck — Schema Markup Checker & Open Graph Meta Tag Validator
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Validate JSON-LD, Microdata & RDFa schema markup, Open Graph, Twitter Cards & meta tags. Google Rich Results checker. Free SEO tool. SchemaCheck validates structured data, Open Graph tags, Twitter Cards, and meta tags on any webpage — all in one click. Get a complete SEO audit with scores, actionable recommendations, and social media previews. WHAT SCHEMACHECK ANALYZES Schema Markup (Structured Data): - JSON-LD — the format recommended by Google for structured data - Microdata — itemscope/itemprop attributes used by many e-commerce sites - RDFa — typeof/property attributes for semantic web markup - Validates against Google Rich Results requirements for 28+ schema.org types - Detects missing required fields, incorrect formats, and optimization opportunities Open Graph & Social Tags: - Open Graph tags (og:title, og:description, og:image, og:url, og:type) - Twitter Card tags (twitter:card, twitter:title, twitter:image) - Social media share preview — see how your page looks when shared on Facebook, Twitter/X, and LinkedIn - Image dimension checks (1200x630 recommended for optimal display) Meta Tags & Technical SEO: - Page title — length check (optimal: 50-60 characters for SERP display) - Meta description — length and quality validation - Canonical URL — duplicate content prevention check - Robots directives — noindex/nofollow detection - Hreflang tags — international SEO validation with x-default check - Viewport, charset, and other technical meta tags SCORING & GRADES Every page gets scored across 4 categories: - Schema Score — structured data completeness and Google Rich Results eligibility - Open Graph Score — social sharing readiness - Twitter Cards Score — Twitter/X card validation - Meta Tags Score — on-page SEO health Overall grade from A (excellent) to F (critical issues), with weighted scoring: Schema (35%), Open Graph (25%), Meta Tags (25%), Twitter Cards (15%). GOOGLE RICH RESULTS VALIDATION SchemaCheck validates your structured data against Google's Rich Results requirements for: Product, Article, NewsArticle, BlogPosting, FAQPage, HowTo, BreadcrumbList, LocalBusiness, Organization, Person, Event, Recipe, VideoObject, WebSite, Review, AggregateRating, SoftwareApplication, Course, JobPosting, Restaurant, and more. For each schema type, see: - Required fields — what Google needs for rich snippets - Recommended fields — what improves your search appearance - Rich Result eligibility — whether your page qualifies for enhanced SERP features - Direct links to Google's documentation ACTIONABLE INSIGHTS Not just a list of errors — SchemaCheck provides prioritized recommendations: - Cross-layer checks: og:title doesn't match schema headline — align for consistency - Impact-based suggestions: Add aggregateRating to show star ratings in search results - Missing schema recommendations for product pages, articles, FAQ pages, and more WHO IS SCHEMACHECK FOR - SEO specialists validating structured data implementation - Web developers debugging JSON-LD, Microdata, or RDFa markup - Content managers checking Open Graph tags before publishing - Digital marketers previewing social media share cards - Site owners wanting to improve Google search appearance - Agencies auditing client websites for schema compliance KEY FEATURES - One-click analysis — no configuration needed - Side Panel UI — results displayed alongside the page - Social media preview cards — Facebook, Twitter/X, LinkedIn mockups - Syntax-highlighted raw JSON-LD viewer - Copy report to clipboard - Export to CSV and PDF - Check history with search - Dark and light theme - 50+ languages supported - Lightweight — fast and efficient - 100% client-side — your data never leaves your browser - Minimal permissions — no background data collection WORKS WITH - WordPress + Yoast SEO / Rank Math schema output - Shopify product pages with structured data - Next.js / Nuxt.js server-rendered schema - Any website with JSON-LD, Microdata, or RDFa markup - Pages with Open Graph and Twitter Card meta tags Unlike other extensions that only check schema OR only check Open Graph, SchemaCheck is the only tool that validates all structured data formats, social tags, and meta tags in one unified audit with scoring. Validate your structured data, fix schema markup errors, optimize Open Graph tags, and improve your Google Rich Results eligibility — all from one extension.