🔒 100% Client-Side Processing | 🚀 21,000+ Monthly Impressions | ⚡ Works Offline
A collection of 13 privacy-first web tools that run entirely in your browser with zero data collection. Perfect for developers, security professionals, and privacy-conscious users.
🌐 Live Site: https://bytetools.io
If ByteTools helps you, please ★ star the repo to support privacy-first tools.
- Regex Tester - Test patterns with 50+ examples (8,794 monthly impressions)
- JWT Decoder - Decode tokens safely (jwt.io alternative) (4,908 monthly impressions)
- URL Encoder - Encode/decode URLs (4,306 monthly impressions)
- JSON Formatter - Format, validate, minify JSON
- Passphrase Generator - Generate secure passphrases
- File Hash Generator - MD5, SHA-1, SHA-256 checksums
- Base64 Encoder - Encode/decode Base64
- QR Generator - WiFi, contact, URL QR codes
- IP Subnet Calculator - CIDR, subnetting, supernetting
- Percentage Calculator - Percentage increase, decrease, and comparisons
- Cost Average Calculator - Dollar-cost averaging for investing
- ROI Calculator - Return on investment for projects and campaigns
- Payback Calculator - Break-even and payback period analysis
7 privacy-first AI developer tools for building production-ready AI applications:
- Prompt Designer - Build prompts visually with variables & templates
- Token Calculator - Calculate costs for GPT-4, Claude, Gemini
- Function Schema Builder - OpenAI function calling schemas
- Guardrail Designer - AI safety & compliance rules
- Chunking Optimizer - RAG document chunking strategies
- Pipeline Designer - Visual AI workflow builder
- Vector Simulator - Test embeddings & similarity
20,000+ words of developer content optimized for "how to" searches:
AI Development Guides:
- AI Prompt Design Best Practices (2,100+ words)
- AI Security Best Practices (18-min read)
- AI Privacy & GDPR Compliance (16-min read)
- RAG Chunking Strategies
- OpenAI Function Calling Guide
Security & Developer Guides:
Popular Blog Posts:
- How to Secure Your OpenAI API Keys (2025)
- Prompt Injection Attacks: Complete Defense Guide
- ChatGPT Privacy Risks Explained
- AI Prompt Engineering Guide (5,400+ words)
- How to Reduce AI API Costs by 60%
- JWT Decode Complete Guide
- 🔒 100% Private: All processing happens in your browser - no data ever leaves your device
- ⚡ Lightning Fast: Static generation with optimized performance
- 📱 Mobile-Optimized: Responsive design works perfectly on all devices
- 🌐 Works Offline: Tools function without internet after initial load
- 🚫 No Registration: Use all tools instantly without creating accounts
- 🛡️ Enterprise-Ready: No data transmission makes it perfect for secure environments
Privacy-First by Design:
- ✅ 100% client-side processing — your data never leaves your browser
- ✅ Zero data collection or tracking (beyond anonymous analytics)
- ✅ Works offline after initial load
- ✅ No registration or sign-up required
- ✅ Enterprise-approved (no data transmission concerns)
Better Than Alternatives:
- vs jwt.io: Your tokens stay local (not sent to Auth0 servers)
- vs regex101: Works offline, no account needed
- vs beautifier.io: No ads, faster performance
- vs password generators: Memorable passphrases, not random strings
- 21,000+ Monthly Search Impressions across Google and Bing
- Bing Leader: 6x more impressions than Google (18K vs 3K)
- Top Performer: Regex Tester with 8,794 monthly impressions
- SEO Recovery: Fixing indexing issues to reach 85+ indexed pages
- Framework: Next.js 15.3.5 with TypeScript
- Styling: Tailwind CSS with gradient designs
- Deployment: Cloudflare Pages (static export)
- Analytics: Google Analytics + Microsoft Clarity + Bing Webmaster Tools
- Monetization: Google AdSense (family-friendly)
- ✅ Zero data collection (vs competitors who track/store data)
- ✅ Works offline (vs server-dependent tools)
- ✅ No registration required (vs account-required tools)
- ✅ Enterprise-approved (no data transmission concerns)
- ✅ Step-by-step tutorials (optimized for "how to" searches)
- Privacy-First: Never add features that compromise client-side processing
- Performance: Maintain fast load times and minimal bundle size
- Accessibility: Ensure all tools work on mobile and desktop
- SEO-Optimized: Target security-conscious and developer audiences
- Enterprise-Ready: Consider compliance and security requirements
We welcome contributions! Focus areas:
- Performance optimizations
- New privacy-first tools
- SEO and accessibility improvements
- Mobile experience enhancements
This project is licensed under the MIT License - see the LICENSE file for details.
Built with privacy in mind | Optimized for performance | Designed for developers