How to use Schema Checker
- Start by adding the text you want to check into Schema Checker.
- Use the Paste JSON-LD or a <script type=application/ld+json> block setting to control the result.
- Schema Checker updates the output automatically as you type.
- When it looks right, Copy to save it.
About this tool
Everything Schema Checker does happens on your own device. Schema Checker assembles valid JSON-LD locally so you can paste it into your page.
The output follows schema.org shapes so search engines can read it. No data is sent anywhere, so it stays fast and private by default.
Frequently asked questions
How do I use Schema Checker?
Schema Checker runs entirely on your device: add your input using the Paste JSON-LD or a <script type=application/ld+json> block control, and it checks it locally in real time.
Does Schema Checker cost anything?
No — Schema Checker is completely free, with no sign-up and no hidden limits.
Where is my data processed by Schema Checker?
Entirely in your browser — Schema Checker keeps your data on your own machine and sends nothing anywhere.
Does Schema Checker validate against schema.org types?
Schema Checker builds and checks the structured-data markup in your browser so you can paste it straight into your page.
Does Schema Checker work on mobile?
Yes — Schema Checker is just a web page and runs on any modern browser, including phones and tablets.