How to Build a React Native Document Scanner with Auto-Detection, Crop, and Export

Turning a phone camera into a reliable document scanner requires accurate edge detection, perspective correction, and clean image output — all in real time. The Dynamsoft Capture Vision React Native SDK handles the heavy lifting, letting you ship a cross-platform document scanner for Android and iOS without writing any native code yourself. What you'll build: A React Native app that auto-detects document edges from the live camera feed, lets users fine-tune the crop with draggable corner handles, apply color modes (full color, grayscale, binary), and export the result as a high-quality PNG. Demo Video: React Native Document Scanner in Action Prerequisites Before starting, make sure you have: Node.js 18+ and npm React Native CLI (not Expo) with React Native 0.79+ Android Studio with an emulator or physical device (Android) Xcode 15+ with CocoaPods (iOS) A Dynamsoft Capture Vision trial or full license key Get a 30-day free trial license at dynamsoft.com/customer/license/trialLicense Ste