How these SEO tools fit together
On-page SEO splits into two jobs: writing the markup and checking what's actually live.
Writing the markup
The meta tag generator builds the title, description and robots tags. The Open Graph generator controls how links look when shared on social platforms and in chat apps. The schema generator writes JSON-LD structured data. SERP snippet checker previews your title against Google's roughly 600-pixel display width, which is a better guide than a character count because "W" is far wider than "i". robots.txt, XML sitemap and hreflang cover crawling and international versions.
Checking a live page
The checkers fetch a real URL from our server. The meta tag checker reads the title, description and social tags. The canonical checker confirms which URL you're asking Google to index. HTTP headers exposes redirects, caching and X-Robots-Tag. The broken link checker tests up to 24 links on a page. DNS and WHOIS help when a site has moved or a domain is about to expire.
Search engines treat most of these tags as hints, not commands. Google may rewrite a title or pick a different canonical if your signals conflict, and it ignores the meta keywords tag entirely. Consistency between canonical, sitemap and internal links matters more than any single tag. For a step-by-step audit, see how to check meta tags and structured data and Open Graph.