isSemantic.net

Free#15 of 24 in Schema Markup Tools

isSemantic.net: A free, standards-focused toolkit for creating, checking, and converting schema markup. Ranked #15 of 24 in Schema Markup Tools by our editors (7.6/10); pricing: Free plan; best for standards-focused markup work.

7.6/10★★★★☆Editor score

Visit isSemantic.net

At a glance

• Editor score
  7.6 / 10
• Pricing
  Free plan
• Best for
  Standards-focused markup work
• Free plan
  Yes
• Paid from
  Free
• Schema validation
  Yes
• Facts checked
  20 Sep 2026

• Where it wins

  • Validates Schema.org, Google rich snippets, JSON-LD, RDFa, and Microdata
  • Converts markup across JSON-LD, RDF, Turtle, N-Triples, and other formats
  • Visualizes structured data through RDF graphs and Schema.org hierarchies

• Where it doesn't

  • No stated integrations with publishing or SEO platforms
  • Does not cover deployment workflows or bulk markup generation
  • Its scope is narrower than tools with broader operational workflows

Our verdict on isSemantic.net

isSemantic.net is a browser-based toolkit for inspecting, validating, generating, editing, visualizing, and converting structured data. It is aimed at website owners, developers, and SEO practitioners who work directly with Schema.org markup, Google Search rich snippets, or related social metadata. The service runs on the web and focuses on standards-oriented markup tasks rather than publishing operations or ongoing site management.

The product’s free model keeps its full set of stated tools accessible without paid tiers. Those tools cover Schema.org and Google rich-snippet validation, checks for JSON-LD, RDFa, and Microdata, and editors for creating structured-data markup. Its type and property browser helps users navigate Schema.org, while RDF graph and hierarchy views make relationships easier to inspect. It also validates Open Graph, Twitter Cards, and Facebook App Links data, extending the toolkit beyond search markup alone.

Format conversion is a notable strength for teams working across structured-data systems. isSemantic.net converts among JSON-LD, Microdata, RDFa, RDF/XML, Turtle, N-Triples, and other RDF formats, making it useful when markup needs to be examined or reshaped for a different workflow. The trade-off is a narrow operational scope: the product does not include integrations, deployment workflows, or bulk generation in its stated positioning. Choose it for standards-focused creation, troubleshooting, visualization, and conversion in a browser. Organizations seeking connected publishing workflows or broader markup operations should consider a tool built around those needs.

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isSemantic.net pricing

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Alternatives to isSemantic.net

• Schema AppA broad enterprise workflow for authoring, deploying, validating, and monitoring schema markup.9.4
• JSON Schema App SaaS SchemaA focused SaaS schema tool with automated generation, validation, and monitoring.9.2
• SDSchema.devA free toolkit for building, validating, testing, and deploying structured data.9.0

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Featured on iTechGuides

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update