Smart SEO Tools
for Modern Developers
Audit pages, generate schema markup, preview search results — all without API costs or subscriptions. Built for developers who value speed and privacy.
Everything you need for Technical SEO
Professional-grade tools that run entirely in your browser. No data leaves your machine.
Technical Auditor
Deep-dive SEO analysis with 50+ checks for meta tags, headings, images, and links
Schema Architect
Generate valid JSON-LD structured data for LocalBusiness, FAQ, Article & more
SERP Simulator
Pixel-perfect Google search preview with real-time truncation simulation
Keyword Density
Smart content analysis with color-coded heatmaps and frequency tables
LLMs.txt Generator
Create AI-friendly documentation to help LLMs understand your website
100% Private
All processing happens in your browser. Your data never leaves your machine
See exactly how your page appears in Google Search
Our pixel-perfect SERP simulator shows you exactly how your title and description will be truncated. Optimize your meta tags for maximum click-through rates.
- Pixel-accurate title truncation
- Desktop & mobile preview modes
- Real-time character counting
- Rich snippet preview support
MarkinUp - Free Technical SEO Auditor Tool
Analyze any webpage for SEO issues. Get instant reports on meta tags, headings, images, and links. 100% free, no signup required...
Explore our other tools
We build useful tools for developers and creators. Check out our other projects.
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