SEO Documentation
Understand crawlability, metadata, canonical URLs, redirects, sitemaps, and search-facing website signals.
Related tools
Website Score
Measure a public website's SEO, performance, accessibility, security, and technical health.
HTTP Status Checker
Check the HTTP response for a URL and review the status, server, and redirect chain.
Headers Checker
Review HTTP response headers for caching, content type, security, and debugging information.
Guides
How to audit a website
A practical workflow for reviewing SEO, technical, security, performance, and accessibility signals.
What is a backlink?
Understand relevant, editorial links and how useful resources earn attention without link spam.
What is a Website Score?
Learn what the SiteIndex diagnostic score measures, how categories are weighted, and where its limits are.
How to check a website score
Run a SiteIndex Website Score check, interpret the categories, and decide what to fix first.
What is robots.txt?
Learn how robots.txt guides compliant crawlers and how it differs from an XML sitemap.
What is an XML sitemap?
Understand what XML sitemaps contain, when they help discovery, and how to check one.