isSemantic RDF Conv.

isSemantic.net RDF Converter is a free, browser-based tool for validating, converting, and visualizing RDF structured data. Published under the "isSemantic.net" brand (copyright 2022), it identifies no specific author or company. Rather than being a downloadable library or CLI, it runs entirely as an online application: users paste markup, upload a snippet, or supply a web address, and the tool processes it in place. Its stated audience overlaps with the SEO and Schema.org community as much as the wider Semantic Web, since it doubles as a validator and generator for Google Search rich-result markup and Open Graph metadata.

At its core the converter treats every input as an RDF graph of subject-predicate-object triples. Because the RDF data model is independent of syntax, any of the supported serializations expresses the same underlying triples, and the tool exploits this to translate freely between them. It reads and writes the standard concrete syntaxes: Turtle and N3, TriG, RDF/XML, N-Triples, N-Quads, JSON-LD, plus the HTML-embedded formats RDFa and Microdata. It also handles the RDF-star family (Turtle-star, TriG-star, N-Triples-star, N-Quads-star, JSON-LD-star) as provisional/draft support for quoted triples. Input format can be chosen explicitly, auto-detected from the data, or set to a "Mixed" mode that simultaneously parses JSON-LD, Microdata, and RDFa embedded in a page.

The visualization component renders the parsed triples as a directed network diagram alongside an HTML tree and a subject-predicate-object table. Its legend distinguishes node and edge roles: types/classes, instances/individuals, literals, object properties, data properties, blank nodes, and quoted triples. For large graphs the diagram can lag in the browser, and the tool suggests falling back to the tabular view.

In the format-conversion landscape it sits alongside other RDF-focused translators such as rdf2rdf, EasyRdf Converter, RDF Grapher, and Zazuko RDF Conv., and library-based stacks like RDFLib (Python), Jena/RIOT, and dotNetRDF. Its distinguishing strengths are a wide serialization matrix in one no-install interface, RDF-star coverage, and integrated validation, generation, and graph visualization. Its limitations follow from being a closed, undocumented web app: there is no published API, source, versioning, or scalability guarantee, and it is oriented toward web-page structured data rather than large-scale batch or programmatic conversion, for which a scriptable library is more appropriate.