Schema.biz

Schema.biz is a free, browser-based toolkit that combines structured-data, database, and API utilities. It is best suited to developers and SEO professionals who want many focused tools without an account. The broad coverage is its strongest argument, while workflows that depend on saved projects, rich-result previews, or ongoing monitoring will find important gaps.

Overview

Schema.biz puts markup generation and checking, database design and analysis, and API specification work in one web interface. The Free plan costs nothing, includes every current tool, has no premium tiers or feature gates, and requires no signup. That makes it a practical starting point for individual practitioners and teams that can work from pasted material rather than a persistent workspace.

Its local-processing approach is significant for sensitive drafts: the tools process pasted data in browser JavaScript, and the maker says that data entered into them is not transmitted to its servers. URL-based markup checks work differently, because Schema.biz's server fetches the requested page for the browser to inspect. HTTPS, Cloudflare CDN and security services protect page integrity; Cloudflare Web Analytics and Google AdSense are named in the privacy policy, while ad partners are said not to access data entered into the tools.

Key features

Structured data and AI search

Markup utilities generate, validate, and optimize JSON-LD, Microdata, and RDFa. That covers both authoring and technical checking for common structured-data formats. The AI Search Optimizer evaluates readiness for ChatGPT Search, Perplexity, and Google AI Overviews, giving SEO specialists a targeted way to assess newer search surfaces. There is no rich-result preview, WordPress support, bulk generation, or markup monitoring, so it is less suitable as a complete publishing or fleet-management workflow.

Database design and analysis

The visual Schema Designer exports SQL for PostgreSQL, MySQL, SQLite, and SQL Server. Additional tools diagram CREATE TABLE statements, compare schema versions, visualize queries, and supply reusable schema templates. This combination suits developers who need quick design and review utilities across several database engines. It is not a substitute for a persistent collaborative modeling environment: persistent cross-device work is explicitly not offered because it would require server-side processing.

API specifications

Current API utilities validate JSON Schema, edit OpenAPI specifications, generate schemas and mock data, convert schema formats, and detect breaking changes. These functions make the toolkit useful during specification and compatibility work, but API access is not included and the API Validator and Mock Server are marked as coming soon. Those planned items should not be treated as available capabilities.

Pricing

The sole Free plan costs nothing. It includes all tools, has no feature gates or stated limits, and needs no signup. There is no free trial because the product is already free, and there are no premium tiers or renewal terms to manage. The trade-off is capability rather than price: no API access, bulk generation, markup monitoring, rich-result preview, or WordPress support.

Platforms

Schema.biz runs on the web. Browser execution is convenient for occasional work from a single device, while the absence of persistent cross-device projects matters to users who need to resume the same work across machines.

Who it's for

Developers can use the database and API utilities alongside schema markup tools, while SEO professionals gain format validation and AI-search readiness checks. It fits independent work, audits, and exploratory design especially well because every current tool is free and no account is required. Agencies managing many URLs, WordPress publishers, and teams requiring saved shared projects or continuous monitoring should look elsewhere or pair it with another service.

Pros and cons

• Pro: One no-signup web toolkit spans JSON-LD, Microdata, RDFa, SQL database design, OpenAPI, and JSON Schema tasks.
• Pro: Browser-side processing keeps pasted data out of the maker's servers, according to the maker's stated behavior.
• Pro: SQL export covers PostgreSQL, MySQL, SQLite, and SQL Server.
• Con: URL checks require a server fetch, so they do not have the same local-processing behavior as pasted data.
• Con: No persistent cross-device work, rich-result preview, WordPress support, bulk generation, or markup monitoring limits production workflows.
• Con: API access is absent, and the API Validator and Mock Server are not current tools.

Alternatives

For a dedicated collection of markup products, see Schema Markup Tools.

Choose Baseline Labs Schema Generator if you need API and web access, a free trial, rolling schema for one domain and five pages, or a paid Standard plan at €79 a month.

EasySchema is another free web option for schema markup and SEO tools when you do not need Schema.biz's database and API breadth.

Pick JSON Schema App SaaS Schema for a limited free setup focused on Product, Service, and Articles, up to 50 URLs, an LLMs.txt generator, and a schema checker.

JSON-LD Generator offers a free web generator with 17 schema types and no signup stated.

Use Rolling Schema when a freemium API-and-web service with one domain, 500 credits per month, five rolling-schema pages, and a 79.00 EUR monthly Standard plan better matches your operation.

Schema.dev is a free API, extension, and web choice for its Schema Tester UI.

SchemaValid is a free browser-based validator with no account or installation.

SEO Schema Markup is a free, MIT-licensed open-source web alternative.

Verdict

Choose Schema.biz if you are a developer or SEO professional who wants a wide set of markup, database, and API utilities at zero cost, with no signup and local handling for pasted data. Look elsewhere if your work depends on saved cross-device projects, URL crawling at scale, rich-result previews, WordPress integration, monitoring, or production API access.