Five free tools.
No signup. Browser-only.
Schema validation, SERP preview, robots.txt generation, structured-data planning. Nothing leaves your browser. Built for SEO practitioners and developers who want speed over sales pages.
Pick the tool you need.
Each tool is a standalone page — fast, focused, and free. Click in to start using it. No account, no payment, no upsell.
Schema Markup Validator
Validate JSON-LD syntax and rich-result eligibility. Catches missing required properties, type conflicts, and deprecated facets. Faster than Google's Rich Results Test for development workflows.
- Article, Product, FAQ, LocalBusiness, Organization, Person, Event, HowTo schemas
- Required and recommended property reporting
- Direct error → fix mapping
Pixel-aware Google snippet preview for desktop and mobile. See what searchers will actually see — title pixel widths, meta description truncation, and rewrite risk.
Open tool →Five templates and AI-crawler control with built-in URL tester. Block GPTBot, ClaudeBot, CCBot, or allow them — your call, with explicit warnings.
Open tool →Map content types to the right schema. Outputs an implementation checklist sorted by impact: Article, Product, FAQ, LocalBusiness, HowTo, Recipe, Event, Person, Organization.
Open tool →Why browser-only?
Three reasons we keep tools 100% client-side instead of routing through a server.
Privacy by construction
Your URLs, your schema, your robots.txt rules — never reach our server. There's nothing to log, nothing to leak.
Speed without round-trips
Validation happens in milliseconds. No server cold starts, no rate limits, no queue. Refreshing is free.
Honest methodology
All checks happen in code you can inspect. Open methodology. No proprietary scoring trickery.
Tools paired with practical writing.
Most articles cite at least one of these tools. Each tool links back to relevant explanations. Not a content farm — a working reference.