# QR Code & PDF Scanner Pro
> Official high-performance barcode scanning, custom QR design studio, and multi-page PDF document processing platform for Android and Web.

## Overview
QR Code & PDF Scanner Pro is a zero-telemetry utility suite providing sub-300ms on-device optical recognition, custom QR code generation with brand logos and custom finder patterns, 1D linear barcode catalog generation (Code 128, EAN-13, UPC-A), and Avery label sheet compilation.

- **Primary Web Address**: https://qrcode-pdf-scanner.com/
- **Developer**: SHREYA APPS
- **Google Play App**: https://play.google.com/store/apps/details?id=com.qr_scanner_app_pro
- **Core Technology**: WebAssembly (ZXing-C++), HTML5 Canvas 2D / WebGL, Google Play Billing & RevenueCat Cross-Platform Entitlements, PayPal Subscriptions, Razorpay UPI.

## Key Capabilities & Technical Specifications

### 1. Optical Recognition & Scanning
- **Engine Speed**: 0.3s real-time recognition via hardware-accelerated camera stream.
- **Offline Guarantee**: 100% on-device optical processing. Camera feeds and scanned documents never leave the client device or touch remote servers.
- **Supported 2D Matrix Symbologies**: QR Code (Model 2, Micro QR), Data Matrix (ECC 200), Aztec Code, PDF417.
- **Supported 1D Barcode Symbologies**: Code 128 (Auto A/B/C), Code 39, Code 93, EAN-13, EAN-8, UPC-A, UPC-E, ITF-14, Codabar.
- **Security & Quishing Protection**: URL inspection engine flags homograph phishing attacks, suspicious top-level domains, and obfuscated redirect chains prior to opening.

### 2. Custom QR Generator Studio
- **Shape Customization**: Dot matrix body patterns (Square, Rounded Squircle, Circular, Diamond, Classy).
- **Finder Patterns**: Customizable eye corner frames (Square, Rounded, Circle, Leaf) and inner eye dots.
- **Coloring**: Hex solid fills, Linear gradients, Radial gradients with contrast ratio validation.
- **Branding & Logos**: Logo embedding with automated 30% Reed-Solomon Error Correction Level H cushion to preserve machine readability.
- **Export Formats**: SVG (Infinitely Scalable Vector), PNG (Up to 4096px Ultra-HD master raster), JPEG, WebP.

### 3. Bulk Barcode Studio & Label Printing
- **Batch Processing**: Upload CSV/Excel spreadsheets containing up to 5,000 SKUs or serial numbers.
- **Sheet Templates**: Direct print layouts for Avery 5160 (30 labels/page) and Avery 5163 (10 labels/page).
- **Batch Export**: 1-Click ZIP archive compilation bundling individual barcode assets.

### 4. PDF Document Digitizer
- **Edge Detection**: Geometric edge corner identification and perspective warp correction.
- **Enhancement Filters**: Color enhancement, B&W high-contrast thresholding, and grayscale document compression.
- **OCR Engine**: On-device optical character recognition for Latin and international scripts.

## Site Structure & Canonical Links
- [Home Portal](https://qrcode-pdf-scanner.com/): Comprehensive product overview, live demos, and security guarantees.
- [Feature Matrix](https://qrcode-pdf-scanner.com/features.html): Complete comparison between Free tier and Scanner Pro Premium.
- [Custom QR Studio](https://qrcode-pdf-scanner.com/qr-generator.html): Interactive QR code designer with real-time preview and SVG export.
- [Barcode Studio](https://qrcode-pdf-scanner.com/barcode-generator.html): 1D barcode generator with CSV bulk uploads and Avery label sheets.
- [Camera Scanner](https://qrcode-pdf-scanner.com/qr-scanner.html): Browser-based camera and screenshot gallery QR reader.
- [PDF Document Scanner](https://qrcode-pdf-scanner.com/document-scanner.html): Document scanner with auto-cropping and PDF export.
- [QR Print & Design Guide](https://qrcode-pdf-scanner.com/qr-tips.html): Technical handbook on contrast ratios, Quiet Zones, and print sizing formulas.
- [How It Works](https://qrcode-pdf-scanner.com/how-it-works.html): Architecture documentation on Reed-Solomon decoding and on-device privacy.
- [FAQ & Knowledge Base](https://qrcode-pdf-scanner.com/faq.html): 35+ technical answers on subscriptions, Google Play billing, and label printing.
- [Privacy Policy](https://qrcode-pdf-scanner.com/privacy.html): Full GDPR, CCPA, and Google Play developer program privacy disclosures.
- [Terms of Service](https://qrcode-pdf-scanner.com/terms.html): End-user license agreement and subscription billing terms.