What this tool checks
Twenty-three signals across four categories, weighted by real ranking impact — a noindex tag costs far more than a missing Twitter card. Every check returns a specific fix, and the report ranks them so you know what to do first.
Technical SEO
- Indexable — not blocked by a noindex robots tag
- Title tag under 60 characters (Google's truncation limit)
- Meta description under 160 characters
- Canonical URL set to prevent duplicate content
- Mobile viewport meta tag
- HTTPS rather than HTTP
- HTML page weight under 500 KB
Content Signals
- Exactly one H1 tag
- Content depth above 500 words
- Alt text on every image
- Internal links to related pages
- Proper H1 → H2 → H3 heading hierarchy
Structured Data
- JSON-LD structured data present
- JSON-LD actually parses as valid JSON
- Organization schema with contactPoint and address
- Open Graph tags (title, description, image)
- Twitter card tags
- FAQ or Breadcrumb schema for rich results
Discovery & AI Agents
- robots.txt exists and allows crawling
- sitemap.xml with valid URL entries
- llms.txt for AI answer engines
- UTF-8 charset declaration
- Language attribute on the html tag
Frequently asked questions
- What does the SEO Score Checker actually check?
- It scans 23 signals across four categories: Technical SEO (indexability, title length, meta description, canonical URL, mobile viewport, HTTPS, page weight), Content (H1 tags, word count, image alt text, internal links, heading hierarchy), Structured Data (JSON-LD presence and validity, Organization schema, Open Graph, Twitter cards, FAQ/Breadcrumb markup), and Discovery (robots.txt, sitemap.xml, llms.txt, charset, language declaration).
- Why does title length matter so much for SEO?
- Google truncates page titles at roughly 60 characters in search results. Every character past that is cut off with an ellipsis, which means your keyword or value proposition may never be seen by searchers. Shorter, front-loaded titles consistently earn higher click-through rates.
- What is llms.txt and do I need one?
- llms.txt is a plain-text file at your site root that tells AI systems like ChatGPT, Claude, and Perplexity what your site covers and when to cite it. It is an emerging standard, not a ranking factor for Google, but it improves how AI answer engines understand and reference your content.
- Is this SEO checker free?
- Yes, completely free with no signup required. Scans are limited to 10 per hour per visitor to keep the tool fast for everyone.
- Can it scan any website?
- It can scan any publicly accessible URL over HTTP or HTTPS. Sites that block bots, require login, or are behind aggressive firewalls may not return results. Private and local addresses are not supported.
Go deeper on SEO
The playbook and analysis behind the checks in this tool.
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