Schema Markup Checker
Free schema markup checker. Extract the JSON-LD structured data from any page, list its schema.org types and spot invalid JSON.
About the Schema Markup Checker
Structured data helps search engines and AI assistants understand what a page is about: an Organization, a SoftwareApplication, an Article, a FAQ. Broken JSON is silently ignored, so check it after every template change.
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Outline H1–H6, flag missing or multiple H1s and skipped levels, copy as Markdown.
Hreflang Checker
List alternate language URLs and flag a missing x-default or invalid codes.
Readability Checker
Flesch Reading Ease and grade level from pasted copy.
Image Alt Checker
List the images on a page and flag missing alt attributes.
FAQ
Is the Schema Markup Checker free?
Yes. The Schema Markup Checker is completely free, with no account, trial or credit card. To keep it fast for everyone, each visitor gets a fair-use rate limit.
Do you store what I check?
No. Our server fetches the URL or domain you enter, sends the result back to your browser and doesn't keep it. We only fetch public addresses.
What should I do after using it?
Fix what it found, then launch your product on ShipX: a free launch gives you a permanent product page with a dofollow link back to your site. Launch on ShipX
Ready to launch?
Launch free on ShipX and get a permanent product page with a dofollow link to your site. No audience required.