# humanstxt.org/
# The humans responsible & technology colophon

# TEAM
    Team: CommonTools Development Team
    Site: https://commontools.top/tools/
    Contact: support [at] commontools.top
    Location: International
    Twitter: @CommonTools
    GitHub: https://github.com/jinweicheng

# THANKS
    Thanks to all users who provide feedback and suggestions
    Special thanks to the open-source community
    Special thanks to Mozilla (PDF.js), Google (Web Standards), FFmpeg team
    Special thanks to React, TypeScript, Vite, and WebAssembly communities
    Libraries: FFmpeg.wasm, PDF.js, JSZip, heic2any, GIF.js, file-saver

# SITE
    Last update: 2026-02-26
    Language: English, Chinese (Simplified)
    Standards: HTML5, CSS3, ES2022, WebAssembly
    Components: React 18.2+, TypeScript 5.0+, Vite 4.0+
    IDE: VS Code, WebStorm
    Version: 2.0
    Pages: Contact Us, About Us

# TECHNOLOGY COLOPHON

    ## Frontend Framework
    React 18.2+ - Component-based UI library
    TypeScript 5.0+ - Type-safe JavaScript
    Vite 4.0+ - Fast build tool and dev server
    React Router 6.0+ - Client-side routing
    Custom CSS - Utility-first styling approach

    ## Core Processing Libraries
    PDF.js (Mozilla) - PDF parsing and manipulation
    JSZip 3.10+ - ZIP archive creation/extraction
    HEIC2ANY - Apple HEIC/HEIF to JPG conversion
    FFmpeg.wasm 0.12.10 - Video/audio processing in browser (H.264, H.265, VP9)
    @ffmpeg/ffmpeg - FFmpeg WebAssembly wrapper
    @ffmpeg/util - FFmpeg utility functions
    Canvas API - 2D graphics and image manipulation
    WebGL - Hardware-accelerated graphics
    MediaRecorder API - Screen recording and video capture
    Web Crypto API - AES-256-GCM encryption/decryption
    File System Access API - Direct file system access
    Web Workers - Background processing threads
    IndexedDB - Client-side storage for caching
    SharedArrayBuffer - High-performance parallel processing

    ## Image Processing
    ImageBitmap API - Efficient image loading
    OffscreenCanvas - Background image rendering
    Canvas 2D Context - Image manipulation and compression
    WebP, AVIF, GIF, JPEG XL - Modern image format support
    Custom TIFF decoder - Uncompressed and PackBits TIFF support
    GIF.js - Animated GIF encoding
    heic2any - HEIC/HEIF format conversion

    ## Infrastructure & Deployment
    Nginx 1.24+ - High-performance web server
    GitHub Actions - CI/CD pipelines
    Cloudflare CDN - Global content delivery
    Let's Encrypt - SSL certificate automation
    Docker - Containerized deployment

    ## Privacy & Security Features
    100% Client-side processing - No server uploads
    End-to-end encryption - AES-256-GCM standard
    Zero-knowledge architecture - Server never sees user data
    CSP (Content Security Policy) - XSS protection
    HTTPS Everywhere - Encrypted connections
    Open source transparency - Auditable code

# FEATURES
    ## Video Tools
    ✓ Video Format Converter (MP4/MOV/MKV/WebM) - Convert between formats
    ✓ Video to GIF Converter - Convert MP4/MOV/WebM to animated GIF
    ✓ Video Compression - H.264/VP9 encoding with quality control
    ✓ iPhone Screen Recording Editor (Crop, Compress, Blur)
    
    ## Image Tools
    ✓ Image Compression - Batch processing with quality control
    ✓ ProRAW/HEIF Converter with EXIF preservation
    ✓ AVIF/WebP Converter with quality control
    ✓ Live Photo to GIF/MP4 Converter
    ✓ Legacy Image Format Converter (BMP/TGA/PCX/TIFF)
    ✓ Modern Image Format Converter (PNG/JPG/WebP/AVIF/GIF)
    ✓ HEIC to JPG Converter for iPhone photos
    ✓ Image Watermark Tool (text/image watermarks, batch, tile/grid/border modes)
    
    ## Image Security Tools
    ✓ Image Encryption (AES-256-GCM, Batch Processing)
    ✓ Image Watermark Tool (text/image watermarks, batch, tile/grid/border modes)
    
    ## PDF Tools
    ✓ PDF Encrypt HTML (Self-Contained Encrypted HTML, SHA-256)
    ✓ PDF Encrypt AES-256-GCM (Encrypt/Decrypt)
    ✓ PDF Watermark (Text, Custom Color/Opacity/Angle, Live Preview)
    ✓ PDF Signature (Handwritten, Multi-Page, Drag & Resize)
    ✓ OCR: Image/PDF/Table OCR (PaddleOCR v4 ONNX, Tesseract.js) - Client-side text recognition and searchable PDF export
    
    ## File Tools
    ✓ Military-grade File Encryption (AES-256-GCM)
    ✓ ZIP Archive Compression/Decompression
    
    ## General Features
    ✓ Batch processing for all tools (up to 5-20 files)
    ✓ Real-time preview and quality control
    ✓ Progress tracking with detailed status messages
    ✓ Cross-platform compatibility
    ✓ 100% local processing - No server uploads

# SEO KEYWORDS
    online tools, free tools, top tools, 2026 tools
    video format converter, MP4 to MOV, MOV to MP4, MKV converter, WebM converter
    video to GIF converter, MP4 to GIF, MOV to GIF, animated GIF maker
    video compression, image compression, batch compression
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    PDF tools, PDF encryption, PDF encrypt HTML, PDF AES-256 encryption, PDF password protection
    PDF watermark, add watermark to PDF, PDF signature, handwritten signature on PDF
    image encryption, encrypt images online, AES-256-GCM image encryption
    electronic signature, file compression, HEIC converter, HEIF converter
    ProRAW converter, screen recording editor, live photo converter
    privacy tools, local processing, browser tools, no upload tools
    image watermark, add watermark to photo, batch watermark, text watermark, logo watermark
    batch processing, format conversion, image optimization
    web tools, productivity tools, utility tools, online image tools
    online video tools, online file tools, free online tools 2026
    contact us, about us

# VALUES
    Privacy First - Your data never leaves your browser
    Professional Quality - Commercial-grade algorithms
    Modern Design - Clean, intuitive interfaces
    Fast & Efficient - Optimized for performance
    Free to Use - No registration or payment required
    Open Source - Transparent and auditable code
    Cross-Platform - Works on any modern browser
    Batch Processing - Handle multiple files at once
    Real-time Preview - See results before processing
    Security Focused - Military-grade encryption standards

# PERFORMANCE
    Core Web Vitals optimized
    Lighthouse score: 95+ (Performance, Accessibility, SEO, Best Practices)
    First Contentful Paint: <1.5s
    Largest Contentful Paint: <2.5s
    Cumulative Layout Shift: <0.1
    First Input Delay: <100ms
    Time to Interactive: <3.5s
    FFmpeg.wasm caching via IndexedDB (30s+ → 1-3s load time)
    Progressive loading and preloading strategies
    Code splitting and lazy loading
    Asset optimization and compression

# ACCESSIBILITY
    WCAG 2.1 AA compliant
    Screen reader friendly
    Keyboard navigation support
    High contrast mode support
    Reduced motion preferences respected

# BROWSER SUPPORT
    Desktop: Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
    Mobile: iOS Safari 14+, Chrome Mobile 90+, Samsung Internet 14+
    Progressive Web App (PWA) support with offline functionality
    WebAssembly support required for video processing
    SharedArrayBuffer support required (COOP/COEP headers)
    Modern browser APIs: WebCodecs, File System Access, Web Workers

# ARCHITECTURE
    Single Page Application (SPA) with React Router
    Component-based architecture with TypeScript
    Web Workers for CPU-intensive tasks
    IndexedDB for persistent caching
    Service Worker for offline support (planned)
    Responsive design with mobile-first approach
    Dark theme with tech/security aesthetic
    Internationalization (i18n) support (English, Chinese)

# SECURITY & PRIVACY
    Content Security Policy (CSP) implemented
    Cross-Origin-Opener-Policy (COOP): same-origin
    Cross-Origin-Embedder-Policy (COEP): require-corp
    Cross-Origin-Resource-Policy (CORP): cross-origin
    HTTPS enforced with HSTS
    No third-party tracking or analytics
    No user data collection or storage
    All processing happens client-side

# DEPLOYMENT
    Nginx reverse proxy with optimized configuration
    Gzip compression enabled
    Static asset caching (1 year for immutable resources)
    CDN integration for FFmpeg.wasm files
    SSL/TLS via Let's Encrypt
    Automated deployment via CI/CD

# LAST UPDATE
    2026-02-11