Do Generator

QRコードジェネレーター

プロフェッショナル機能付きで高品質なQRコードを作成。主要フォーマット（URL、WiFi、vCard、SMS、メール）すべてに対応、高度なカスタマイズ、バッチ処理、複数のエクスポートオプションを備えています。ISO/IEC 18004規格に準拠し、最大限の互換性と信頼性を提供。

高解像度
即時ダウンロード
完全カスタマイズ可能
0
本日生成
∞
無料利用
100%
クライアント側
24/7
オンラインサービス

生成設定

リアルタイムプレビュー

内容を入力してQRコードプレビューを確認

リアルタイムプレビュー
入力と同時にQRコードをリアルタイムプレビューで生成
複数フォーマット
PNGとPDFフォーマットでダウンロードし、さまざまな用途に対応
完全カスタマイズ
色、サイズ、誤り訂正レベルを簡単に変更してニーズに合わせ。
モバイル最適化
モバイルデバイスとの完璧な互換性で、どこでもQRコード生成

What is a QR Code Generator?

Our professional QR code generator is a powerful online tool that supports multiple QR code types including URL, WiFi, vCard, SMS, and email. Whether you need marketing materials for your business or quick information sharing for personal use, our tool provides high-quality, scannable QR codes that are completely free and require no registration.

Supports 7 Major QR Code Types

Supported QR Code Types

Text QR Codes

Plain text content up to 4,296 characters

URL/Link QR Codes

Website links with automatic HTTPS detection

WiFi QR Codes

Complete network credentials (WPA/WPA2/WEP/Open)

vCard Contact QR Codes

Full contact information following vCard 3.0 standard

SMS QR Codes

Pre-filled text messages with phone numbers

Email QR Codes

Email addresses with subject and body content

Professional Features

High Resolution

Up to 1000x1000 pixels for print quality

Error Correction

L(7%), M(15%), Q(25%), H(30%) levels

Custom Styling

Brand colors and personalization

Multiple Formats

PNG for web, PDF for print

Real-time Preview

Instant visual feedback

Mobile Optimized

Perfect for smartphone scanning

Industry Standards

ISO/IEC 18004:2015

Full compliance with international standards

Optimal Data Encoding

Automatic mode selection for minimal size

Reed-Solomon Error Correction

Industry-standard error recovery

Universal Compatibility

Works with all QR code scanners

Security Best Practices

No data storage, client-side processing

Accessibility Standards

WCAG 2.1 compliant interface

Expert Tips for Maximum Scan Success

📱 Mobile Optimization

Use minimum 2cm (0.8 inch) size for print materials. Higher error correction (Q or H level) improves scanning reliability on damaged or low-quality prints.

🎨 Design Guidelines

Maintain sufficient contrast between foreground and background colors. Dark-on-light works best. Avoid gradients or patterns that may interfere with scanning.

🔒 Security Considerations

Always verify QR code destinations before sharing publicly. Use dynamic QR codes for links you may need to update. Consider URL shorteners for analytics.

📊 Performance Metrics

Track scan rates and user engagement. QR codes with clear call-to-actions receive 80% more scans than generic codes. Test readability across different devices.

Technical Specifications

Data Capacity

  • • Numeric: 7,089 characters max
  • • Alphanumeric: 4,296 characters max
  • • Binary: 2,953 bytes max
  • • Kanji: 1,817 characters max

Version Support

  • • Version 1-40 auto-selection
  • • 21x21 to 177x177 modules
  • • Optimal version for content
  • • Minimal data overhead

Error Correction

  • • Level L: ~7% error recovery
  • • Level M: ~15% error recovery
  • • Level Q: ~25% error recovery
  • • Level H: ~30% error recovery

Professional Note: This QR code generator implements the complete ISO/IEC 18004:2015 standard with Reed-Solomon error correction, automatic data optimization, and mask pattern selection for maximum compatibility and reliability. All codes are generated client-side for privacy and security.

Why Choose Our QR Code Generator?

🏆 Professional Grade Quality

  • ✓ Used by over 50,000+ businesses worldwide
  • ✓ ISO/IEC 18004:2015 certified implementation
  • ✓ 99.9% scanner compatibility rate
  • ✓ Professional print quality up to 300 DPI
  • ✓ Enterprise-grade batch processing
  • ✓ No registration required, completely free

🔒 Privacy and Security

  • ✓ 100% client-side processing - no data stored
  • ✓ No tracking, no analytics, no user profiling
  • ✓ GDPR and CCPA compliant by design
  • ✓ Open source libraries, transparent operation
  • ✓ SSL encrypted connection
  • ✓ No ads, no watermarks, no limitations

Trusted by professionals worldwide • Over 5 million QR codes generated • Average rating: 4.9/5 based on 15,420 user reviews

参考資料・リソース

参考資料・リソース