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isSemantic.net
What it is
isSemantic.net is a free web tool for working with 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 vocabularies beyond Schema.org is displayed in an “Other vocabulary markup” section instead of being validated. The generator creates or edits examples for Google Search, Schema.org, Open Graph and Twitter Cards. Users can add Schema.org properties or import a snippet. Google and Schema.org output is JSON-LD, while Open Graph and Twitter Cards output is RDFa. An RDF visualizer presents data as a graph, triples table and hierarchy. It supports formats such as JSON-LD, N-Quads, RDF/XML, TriG and Turtle, with provisional RDF-star support. A converter accepts a web address or pasted code, detects formats and converts RDF serializations. The service runs on the web and is free.
For and against
For
- Free web access
- Validates JSON-LD, RDFa and Microdata
- RDF graph, table and hierarchy views
- Converts many RDF serializations
- Generates JSON-LD and RDFa
Against
- Non-Schema.org vocabularies are not validated
- RDF-star support is provisional
- Private, non-commercial use only
- Search appearance is not guaranteed
The verdict
isSemantic.net combines validation, markup creation, RDF visualization and conversion in one browser tool. Its vocabulary limitation, provisional RDF-star status and private-use terms should guide your choice.
Who it suits
It suits people who need browser-based structured-data validation, generation, visualization or conversion. The terms limit use to private, non-commercial purposes.
On the record
- 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.issemantic.net · read 4 Oct 2026
- Generated formats
- The generator outputs JSON-LD for Google and Schema.org markup and RDFa for Open Graph and Twitter Cards.issemantic.net · read 8 Oct 2026
- Generator
- The generator creates and edits markup from Google Search, Schema.org, Open Graph and Twitter Cards examples, and supports custom Schema.org snippets.issemantic.net · read 8 Oct 2026
- Generator formats
- Generated Google and Schema.org markup is provided as JSON-LD, while Open Graph and Twitter Cards markup is provided as RDFa.issemantic.net · read 4 Oct 2026
- 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.issemantic.net · read 8 Oct 2026
- Purpose
- isSemantic.net validates, visualizes, generates and converts structured data on websites.issemantic.net · read 8 Oct 2026
- RDF conversion
- The converter can take data from a web address or pasted markup and can auto-detect the input format.issemantic.net · read 8 Oct 2026
- 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.issemantic.net · read 4 Oct 2026
- RDF formats
- The visualizer supports formats including JSON-LD, Microdata, N-Quads, N-Triples, N3, RDFa, RDF/XML, TriG and Turtle.issemantic.net · read 8 Oct 2026
- 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.issemantic.net · read 8 Oct 2026
- RDF visualization
- The visualizer displays RDF triples as a graph and lists their relations in a table, in the browser without software installation.issemantic.net · read 8 Oct 2026
- RDF visualizer
- The visualizer displays RDF data as a graph and also lists triples in a table and hierarchical view.issemantic.net · read 4 Oct 2026
- Result disclaimer
- The validator says it does not guarantee that correctly marked-up data will appear in search results.issemantic.net · read 8 Oct 2026
- Service limitation
- The site does not guarantee that correctly validated structured data will appear in search results.issemantic.net · read 4 Oct 2026
- 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.issemantic.net · read 4 Oct 2026
- 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.issemantic.net · read 4 Oct 2026
- 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.issemantic.net · read 8 Oct 2026
- Validation formats
- The validator accepts JSON-LD, RDFa and Microdata.issemantic.net · read 8 Oct 2026
