On-Page SEO Checker (Paste HTML)
Paste a page's HTML to check its title, meta description, heading structure (H1–H6), image alt text, word count, links and canonical tag — all in your browser.
How to use
- 1Open the page, view source (Ctrl/Cmd + U), copy everything and paste it here.
- 2Fix any issues listed, from most to least important.
How it's calculated
The HTML is parsed for <title>, meta description, canonical link, headings in order, <img> alt attributes, <a> links and the visible text. Checks follow common SEO guidelines (one H1, no skipped heading levels, 50–60 character titles, 120–158 character descriptions).
Frequently asked questions
Why paste HTML instead of a URL?
Browsers block pages from reading other websites directly. Pasting the source keeps everything private and works for pages that aren't public yet.
Does every page need exactly one H1?
It's a strong convention and good for accessibility, though Google says multiple H1s aren't a ranking penalty. Heading order matters for screen readers.
Is this a full SEO audit?
No — it checks on-page basics. Speed, backlinks, crawlability and content quality also matter.