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SPECIFICTION
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isSemantic.net

issemantic.net

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Spec score 7.3 #15 of 24 in Schema Markup Tools

What it is

isSemantic.net is a free web tool for validating, generating, visualizing and converting structured data. Its validator accepts JSON-LD, RDFa and Microdata and checks them against Schema.org, Google Search, Facebook Open Graph, Twitter Cards, Facebook App Links and HTML outline semantics. Markup using other vocabularies appears separately and is not validated. The generator creates or edits examples for Google Search, Schema.org, Open Graph and Twitter Cards, accepts imported snippets and allows added Schema.org properties. Google and Schema.org output is JSON-LD; Open Graph and Twitter Cards output is RDFa. The RDF visualizer shows a graph, triples table and hierarchy. It supports formats including JSON-LD, Microdata, N-Quads, N-Triples, N3, RDFa, RDF/XML, TriG and Turtle, with provisional RDF-star support. The converter accepts a URL or snippet, detects formats and converts serializations. Terms restrict use to private, non-commercial purposes.

Spec sheet

Purpose
isSemantic.net validates, visualizes, generates and converts structured data on websites.Read 8 Oct 2026 · issemantic.net
Support
The maker provides a Contact us link and says users with queries about the terms can contact them, but the opened pages do not state a support response commitment.Read 4 Oct 2026 · issemantic.net
Data handling
The terms say the service accesses third-party websites only to analyze publicly available structured data and does not store or redistribute that accessed data.Read 4 Oct 2026 · issemantic.net
Generated formats
The generator outputs JSON-LD for Google and Schema.org markup and RDFa for Open Graph and Twitter Cards.Read 8 Oct 2026 · issemantic.net
Generator
The generator creates and edits markup from Google Search, Schema.org, Open Graph and Twitter Cards examples, and supports custom Schema.org snippets.Read 8 Oct 2026 · issemantic.net
Generator formats
Generated Google and Schema.org markup is provided as JSON-LD, while Open Graph and Twitter Cards markup is provided as RDFa.Read 4 Oct 2026 · issemantic.net
Privacy and cookies
The site says it uses cookies and similar technologies, offers consent controls, and says IP addresses are needed for main features and stored for legal claims.Read 8 Oct 2026 · issemantic.net
RDF conversion
The converter can take data from a web address or pasted markup and can auto-detect the input format.Read 8 Oct 2026 · issemantic.net
RDF converter
The converter accepts a web address or code snippet, can auto-detect input format and converts between RDF serialization formats including RDF-star formats.Read 4 Oct 2026 · issemantic.net
RDF formats
The visualizer supports formats including JSON-LD, Microdata, N-Quads, N-Triples, N3, RDFa, RDF/XML, TriG and Turtle.Read 8 Oct 2026 · issemantic.net
RDF visualization
The visualizer displays RDF triples as a graph and lists their relations in a table, in the browser without software installation.Read 8 Oct 2026 · issemantic.net
RDF visualizer
The visualizer displays RDF data as a graph and also lists triples in a table and hierarchical view.Read 4 Oct 2026 · issemantic.net
RDF-star support
RDF-star conversion and validation are supported, but the site describes this support as provisional because RDF-star is an unofficial draft.Read 8 Oct 2026 · issemantic.net
Result disclaimer
The validator says it does not guarantee that correctly marked-up data will appear in search results.Read 8 Oct 2026 · issemantic.net
Service limitation
The site does not guarantee that correctly validated structured data will appear in search results.Read 4 Oct 2026 · issemantic.net
Usage terms
The terms restrict use to private, non-commercial purposes and say access may be suspended, restricted or terminated at any time without notice.Read 4 Oct 2026 · issemantic.net
Use restriction
The terms state that use is for private, non-commercial purposes and that accessed third-party structured data is not stored or redistributed.Read 8 Oct 2026 · issemantic.net
Validation formats
The validator accepts JSON-LD, RDFa and Microdata.Read 8 Oct 2026 · issemantic.net
Validation limitation
Markup using vocabularies beyond Schema.org is shown in an Other vocabulary markup section and is not validated by the tool.Read 8 Oct 2026 · issemantic.net
Validator
The validator checks Schema.org, Google Search, Facebook Open Graph, Twitter Cards, Facebook App Links and HTML heading semantics.Read 8 Oct 2026 · issemantic.net
Validator limitation
Markup using vocabularies other than Schema.org is shown in an “Other vocabulary markup” section rather than validated.Read 4 Oct 2026 · issemantic.net

Strong points and limits

Strong points

  • Validates JSON-LD, RDFa and Microdata
  • Generates JSON-LD and RDFa markup
  • Visualizes RDF as graph and tables
  • Converts many RDF serializations
  • Runs in the browser without installation

Limits

  • Non-Schema.org vocabularies are not validated
  • RDF-star support is provisional
  • Use is restricted to private, non-commercial purposes
  • Search-result appearance is not guaranteed

Who it suits

It suits people creating or checking structured data directly in a browser. Users working with non-Schema.org vocabularies or commercial projects should note the stated restrictions and validation limits.

Verdict

isSemantic.net brings common structured-data tasks into one free web tool. Its format coverage is broad, but validation scope, provisional RDF-star support and usage terms define clear boundaries.

Where Specifiction places it

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