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HTML SEO Checker

Check the on-page SEO basics of any page from its HTML.

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How to use the html seo checker

Paste a page's HTML to check the on-page basics search engines look at: whether the title is 30 to 60 characters, whether the meta description is 120 to 160 characters, a single H1, a mobile viewport tag, alt text on images, Open Graph tags for social sharing, structured data and a canonical URL. Each check passes, warns or fails with a short tip.

  1. Paste the page's HTML (View Page Source, then copy) or upload an .html file.
  2. Read the results for each check: pass, warning or error.
  3. Follow the tips to fix what's missing, then check again.

When to use it

  • Before publishing

    Check a new page's title, description and headings.

  • Social sharing

    Make sure Open Graph tags are set so links show a proper preview.

  • Quick audits

    Spot missing canonical tags or structured data on a template.

Frequently asked questions

What does the SEO checker look at?

Title length (30 to 60 characters), meta description length (120 to 160 characters), the number of H1 headings, the viewport meta tag, image alt text, Open Graph title, description and image, structured data (JSON-LD) and the canonical URL.

Will passing every check improve my rankings?

These are on-page basics that help search engines understand and display your page. Rankings also depend on content quality, links, speed and much more, which this tool doesn't measure.

Why 30 to 60 characters for the title?

Search results usually show about 50 to 60 characters of a title. Shorter titles waste space; longer ones get cut off.

Can I check a live URL?

Paste the page's HTML instead (View Page Source, then copy). Browsers don't let one website read another site's HTML directly.

Is my HTML uploaded?

No. Everything runs in your browser; nothing you paste or upload is sent to our servers.