# YO SEO Tools

> Privacy-first, browser-native SEO engineering and webmaster toolkit with 132 production utilities for technical SEO, content optimization, structured data, security, media, and performance analysis.

## Overview
YO SEO Tools is a modern, high-performance SEO workbench built for technical SEOs, web developers, content creators, and digital marketers. All text, code, schema, and media utilities execute directly within the user's browser using client-side Web APIs, ensuring complete data privacy and zero retention.

## Core Capabilities
- **Technical SEO & Crawl Intelligence**: Robots.txt generators, sitemap validators, canonical analyzers, HTTP status checkers, and redirect chain testers.
- **Content & Copywriting Tools**: Real-time keyword density, readability scorers, word counters, headline analyzers, and meta description generators.
- **Structured Data & Schema**: Schema generators and validators for JSON-LD, Microdata, BreadcrumbList, Organization, Product, and FAQPage.
- **Security & Server Headers**: Security header auditors, CSP builders, SSL/TLS certificate inspect, HSTS validators, and DNS records lookups.
- **Media & Asset Optimization**: WebP/AVIF image converters, SVG optimizers, favicon generators, and responsive image markup calculators.
- **Performance & Web Vitals**: TTFB testers, minifiers for HTML/CSS/JS, Core Web Vitals diagnostic helpers, and cache header inspect.
- **Social & Open Graph**: Open Graph and Twitter Card preview generators, tag builders, and social share markup validators.
- **Link & Authority Intelligence**: Anchor text analyzers, internal link extractors, UTM parameter builders, and link relationship checkers.

## Categories
- [Writing & Text](https://yoseotools.com/tools/writing-text): Precision word metrics, reading speed calculations, case conversions, and typography normalization. Engineered with 100% client-side execution to keep confidential drafts, legal agreements, and manuscripts secure in your browser memory.
- [Image & Design](https://yoseotools.com/tools/image-design): Client-side image compression, multi-format conversion (HEIC, WebP, PNG, JPG, SVG, AVIF), cropping, and binary ICO generation. Optimize visual assets for lightning-fast web delivery without cloud storage queues or file size leaks.
- [SEO & Keywords](https://yoseotools.com/tools/seo-keywords): Authoritative technical on-page diagnostics, keyword density extraction, SERP snippet simulation, and RFC 9309 robots.txt validation. Actionable ranking hygiene workflows built with zero fabricated score algorithms.
- [Website & Performance](https://yoseotools.com/tools/website-performance): Factual server TTFB measurements, HTTP compression verification, RFC 9116 security.txt generation, W3C CSP analysis, and client-side web server log parsing. Deep technical webmaster tooling with zero synthetic Lighthouse inflation.
- [PDF & Documents](https://yoseotools.com/tools/pdf-documents): Merge, split, rotate, convert, and protect PDF documents entirely within browser memory via WebAssembly. Private documents, financial records, and contracts never transmit across the network.
- [Utilities & Developer](https://yoseotools.com/tools/utilities-developer): Syntax-validating JSON formatters, Base64 converters, UUID v4 generators, UNIX timestamp translators, and multi-mode timesheet work hours trackers. Instant developer utilities designed for clean engineering workflows.
- [AI Search & GEO](https://yoseotools.com/tools/ai-search-geo): Prepare your web infrastructure for generative AI retrieval. Generate and validate llms.txt, audit AI crawler permissions (GPTBot, ClaudeBot, PerplexityBot), inspect server logs for AI bot signatures, and construct content licensing policies.
- [Marketing & Business](https://yoseotools.com/tools/marketing-business): Financial planning and ad monetization suite. Calculate ROI, ROAS, CPM, CPC, profit margins, statutory sales tax, and freelance rates with step-by-step arithmetic transparency and zero financial data transmission.

## Key Platform Links
- [All Tools Directory](https://yoseotools.com/tools)
- [Full LLM Tool Manifest](https://yoseotools.com/llms-full.txt)
- [About & Architecture](https://yoseotools.com/about)
- [Pricing & Free Tier](https://yoseotools.com/pricing)
- [Privacy Policy](https://yoseotools.com/privacy)
- [XML Sitemap](https://yoseotools.com/sitemap.xml)

## Privacy & Security Architecture
- **Client-Side Processing**: Standard tools execute entirely inside the client's browser using JavaScript, Web Crypto, Canvas, and Web Workers.
- **Zero Input Retention**: Sensitive input text, passwords, and source code are never uploaded, logged, or stored.
- **Stateless Server Checks**: Real-time network and DNS inspection tools operate strictly statelessly with no persistent query logging.