SEO & Web

On-page SEO, meta tags, sitemaps, robots & schema

Free tools for people who run a website: audit a page's on-page SEO, preview how it will look in Google and on social networks, and generate the files search engines expect — meta and Open Graph tags, robots.txt, XML sitemaps, JSON-LD structured data and campaign URLs. Everything runs in your browser; nothing you paste is uploaded.

On-Page SEO Analyzer

Paste a page's HTML to check 30 on-page items — title, description, headings, canonical, robots, alt text, Open Graph and JSON-LD — with the score formula shown.

Google SERP Preview

Paste a title, description and URL to see the desktop and mobile Google result side by side, with the exact pixel width and where each one is cut.

Meta Tag Generator

Fill in a form to generate meta, Open Graph and Twitter Card tags, and see the link preview for Google, Facebook, X, LinkedIn, Discord, Slack and KakaoTalk.

Robots.txt Generator & Tester

Build a robots.txt and test any URL against it. RFC 9309 matching shows which line wins, for Googlebot, Bingbot, GPTBot and more.

XML Sitemap Generator & Validator

Paste a URL list to build sitemap.xml — auto-split at 50,000 URLs or 50MB with an index. Or paste an existing sitemap to validate it.

Schema Markup Generator (JSON-LD)

Build JSON-LD for Article, Product, LocalBusiness, Event and 9 more — or paste markup to validate it. Shows which types still earn a rich result.

Keyword Density Checker

Count word and phrase frequency in text or HTML, with Korean, Japanese and Chinese word segmentation, stop words and a keyword placement checklist.

UTM Campaign URL Builder

Build campaign URLs with utm_source, utm_medium and utm_campaign. Warns about capitals, spaces, gclid conflicts and internal links. Bulk CSV included.