⚡ SEO & Schema · Client-side · No data sent to server

Canonical Tag Checker

Paste a page’s HTML to inspect its canonical tag: whether it exists, is self-referencing, uses an absolute URL, and matches the og:url. Common mistakes are flagged. Everything runs in your browser.

Page HTML

Why canonicals matter. A canonical tag tells search engines which URL is the preferred one for duplicate or near-duplicate pages. It should be a single, absolute, self-referencing URL on most pages. HTML is parsed inertly in your browser and never uploaded.

Related seo & schema tools

Article Schema Generator Generate Article JSON-LD structured data. FAQ Schema Generator Generate FAQ JSON-LD structured data. HowTo Schema Generator Generate HowTo JSON-LD structured data. Product Schema Generator Generate Product JSON-LD structured data. Event Schema Generator Generate Event JSON-LD structured data. Breadcrumb Schema Generator Generate BreadcrumbList JSON-LD structured data.