Schema Markup Validator vs SEOMarkup Schema Inspector (2026): which should you pick?

Pick Schema Markup Validator if

• Fits if you're a developer checking that schema.org markup is well formed
• Works for sites using structured data for engines and apps other than Google

Look elsewhere if

• Skip it if you want to know about Google rich results, which need Google's Rich Results Test
• Too light for a whole site, as it checks one URL or snippet per run
• Not for you if you want saved history or scheduled checks, as the page offers neither
• Watch out: it's hosted by the schema.org community project, not a company selling support

Pick SEOMarkup Schema Inspector if

• Fits if you debug structured data before a release and want to read it as a tree
• Works for seeing which schema types a competitor's page uses

Look elsewhere if

• Skip it if the page uses Microdata or RDFa, which are only flagged, not shown
• Too light for validation on its own, as that means opening Google's or Schema.org's tester
• Not for you if you use Firefox or Safari, as it runs in Chromium browsers only
• Watch out: the developer hasn't identified itself as a trader, so EU consumer rights don't apply

Schema Markup Validator

• Does not tell you whether a page qualifies for Google rich results; Google's Rich Results Test does that.
• Tests one URL or one snippet per run; the page offers no site crawl, scheduling or saved history.
• Hosted by the schema.org project, a community effort founded by Google, Microsoft, Yahoo and Yandex, not a company selling support.

SEOMarkup Schema Inspector

• Microdata and RDFa are only detected and labelled, not displayed; full parsing covers JSON-LD.
• Validation happens by opening Google's Rich Results Test or validator.schema.org, not inside the extension.
• It is listed for Chrome, and the vendor says it works in other Chromium-based browsers; there is no Firefox or Safari version named.
• The Chrome Web Store notes the developer has not identified itself as a trader, so EU consumer rights do not apply.

Schema Markup Validator

Fetch a URL

Enter a page address and the validator fetches the page and checks the structured data embedded in it.

Test a code snippet

Paste markup into the editor to check it before it is published, and rerun the test after each change.

Any schema.org type

Checks syntax and compliance with schema.org standards for every type in the vocabulary, not only the ones Google uses for rich results.

No Google-specific warnings

Google describes it as validating schema.org data without Google feature-specific warnings, which its Rich Results Test covers instead.

Interface in many languages

The validator's interface can be switched between dozens of languages, including Japanese, German, Hindi, Arabic and Spanish.

SEOMarkup Schema Inspector

JSON-LD tree view

Parses every JSON-LD script block, splits @graph arrays into separate schemas and shows each as an expandable tree.

Full-text search

Search for a property name, value or URL across all schemas on the page, with next and previous match buttons.

Copy, download, validate

Copy a schema as raw JSON or a ready-to-paste script tag, download it as a .json file, or open the page in Google's Rich Results Test or validator.schema.org.

Parse error banners

When a JSON-LD block is malformed, a banner shows which block broke and why.

Microdata and RDFa detection

Flags when a page also uses Microdata or RDFa, though only JSON-LD is shown in full.

Schema.org links

Click any schema type to open its documentation on Schema.org.

Schema Markup Validator

• Free$0

  Validates schema.org markup from a fetched URL or a pasted code snippet, with the interface in several languages.

SEOMarkup Schema Inspector

• Free$0

  Every feature of the extension, free from the Chrome Web Store with no account.