Free SEO Check Tool
Fetch a public page and review SEO-relevant metadata such as title, description, canonical, robots directives, headings, and response information.
Common use cases
- Check title tags and meta descriptions before publishing a page.
- Verify canonical and robots directives after SEO or CMS changes.
- Spot basic on-page issues while comparing DNS, SSL, and header health.
The SEO checker fetches the public page and inspects response status, redirects, title, description, headings, canonical and robots directives, social metadata, images, links, and related discovery signals.
Confirm eligibility before optimizing presentation
A polished title cannot help a page that crawlers cannot fetch or index. Start with the final status code, robots controls, canonical destination, rendered main content, internal links, and sitemap discovery.
- Make the title and primary heading accurately describe the page purpose.
- Use a self-referencing canonical on unique indexable pages when duplicate URL variants are possible.
- Keep important content and links in accessible, server-rendered or reliably rendered HTML.
Treat automated findings as evidence, not a score
Character counts and tag presence are diagnostics, not universal ranking rules. Search engines may rewrite titles and snippets, choose a different canonical, or ignore structured data when other signals better represent the page.
- Inspect the URL in Search Console to see the selected canonical and rendered page.
- Compare queries and click-through rate before rewriting titles that already perform well.
- Validate only structured-data types that accurately describe visible page content.
Standards and further reading
Diagnostic output is evidence, not a guarantee of security, deliverability, availability, or search ranking. Read the NerdTools methodology and limitations before making consequential changes.
Frequently asked questions
What does the SEO checker inspect?
It inspects common page metadata and response details including title, description, canonical URL, robots directives, and other SEO signals.
Do I need to install anything?
No. NerdTools runs the SEO check from the web interface for public URLs and hosts.