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Schema.biz
What it is
Schema.biz is a free, browser-based toolkit for structured data markup, database schemas, and API specifications. Its markup tools generate, validate, and optimize JSON-LD, Microdata, and RDFa. For database work, the visual Schema Designer exports SQL for PostgreSQL, MySQL, SQLite, and SQL Server; other tools diagram CREATE TABLE statements, compare schema versions, visualize queries, and provide reusable templates. API tools validate JSON Schema, edit OpenAPI specifications, generate schemas and mock data, convert schema formats, and detect breaking changes. An AI Search Optimizer evaluates structured data for readiness for ChatGPT Search, Perplexity, and Google AI Overviews. Pasted data is processed in browser JavaScript, and the maker says entered tool data is not sent to its servers. For markup checks using a URL, however, the server fetches the requested page for the browser to inspect. The free plan includes all tools without feature gates or usage limits and requires no signup. Persistent cross-device work and third-party URL crawling are not offered.
For and against
For
- Generates and validates JSON-LD, Microdata, and RDFa.
- Exports SQL for four listed database systems.
- Includes OpenAPI editing and JSON Schema validation.
- Free access has no feature gates or usage limits.
Against
- URL-based markup checks require a server page fetch.
- Persistent cross-device work is not offered.
- Third-party URL crawling is not offered.
- API Validator and Mock Server are coming soon.
The verdict
Schema.biz brings structured data, database, and API utilities into a free web toolkit. Note the server fetch for URL checks and the absence of persistent cross-device work.
Who it suits
Schema.biz is aimed at developers and SEO professionals working with structured data, databases, and API specifications. It suits people who want browser-based tools without signup or usage limits.
Plans and prices
Free
All tools · no premium tiers · no feature gates · no limits
Read 7 Oct 2026 · schema.biz
On the record
- AI search
- The AI Search Optimizer evaluates structured data for readiness for ChatGPT Search, Perplexity, and Google AI Overviews.schema.biz · read 7 Oct 2026
- Analytics and ads
- The privacy policy names Cloudflare Web Analytics and Google AdSense, and says ad partners do not access data entered into the tools.schema.biz · read 7 Oct 2026
- API tools
- API tools validate JSON Schema, edit OpenAPI specifications, generate schemas and mock data, convert schema formats, and detect breaking changes.schema.biz · read 7 Oct 2026
- Database analysis
- Database tools can diagram CREATE TABLE statements, compare schema versions, visualize queries, and provide reusable schema templates.schema.biz · read 7 Oct 2026
- Database design
- The visual Schema Designer exports SQL for PostgreSQL, MySQL, SQLite, and SQL Server.schema.biz · read 7 Oct 2026
- Notable limits
- The maker identifies persistent cross-device work and third-party URL crawling as features it does not offer because they require server-side processing.schema.biz · read 7 Oct 2026
- Planned features
- The API page labels an API Validator and Mock Server as coming soon.schema.biz · read 7 Oct 2026
- Runs locally
- The tools process pasted data in browser JavaScript, and the maker says that data entered into tools is not transmitted to its servers.schema.biz · read 7 Oct 2026
- Security
- The privacy policy says the site is served over HTTPS and uses Cloudflare CDN and security services to protect page integrity.schema.biz · read 7 Oct 2026
- Structured data
- Its markup tools generate, validate, and optimize structured data, including JSON-LD, Microdata, and RDFa.schema.biz · read 7 Oct 2026
- Support
- Users can report issues or send feedback to [email protected].schema.biz · read 7 Oct 2026
- URL checks
- For markup tools that check a URL, Schema.biz's server fetches the requested page for the browser to inspect.schema.biz · read 7 Oct 2026
- What it does
- Schema.biz provides browser-based tools for structured data markup, database schemas, and API specifications.schema.biz · read 7 Oct 2026
- Who it is for
- The maker describes its audience as developers and SEO professionals working with structured data, databases, and API specifications.schema.biz · read 7 Oct 2026
