QRコード生成ツール オンライン無料版
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なぜこれが最高のオンラインQRコード生成ツールなのか
純粋なブラウザ処理、アップロード不要
The entire QR encoding algorithm — Reed-Solomon error correction, data encoding, matrix placement, masking — runs in JavaScript on your device. Nothing is ever sent to a server. Your URLs and text stay private.
ISO/IEC 18004 Compliant
Implements QR Code Model 2 to the ISO/IEC 18004 standard. Supports numeric, alphanumeric, and byte encoding modes with automatic mode detection, and all four error correction levels (L, M, Q, H).
SVG & PNGエクスポート
Download as SVG for infinitely scalable vector output — perfect for print, signage, and business cards — or PNG for web embeds. SVG output can be opened in Inkscape or Illustrator to add logos or styling.
構造化テンプレート
Pre-filled templates for common QR formats: plain URLs, email (mailto:), phone (tel:), SMS, WiFi credentials (WIFI:T:WPA;S:…), and vCards. Just fill in your details.
よくある質問
What types of data can a QR code contain?
QR codes can encode URLs, plain text, email addresses (mailto:), phone numbers (tel:), SMS messages (smsto:), WiFi credentials (WIFI:T:WPA;S:name;P:pass;;), and vCards. Use the template buttons above to generate correctly formatted strings.
What is error correction level and which should I use?
Error correction makes the QR code readable even when partially obscured. L (7%) is good for clean digital displays. M (15%) is the default and suits most printed uses. Q (25%) is good for outdoor printing where minor damage is expected. H (30%) is required if you want to overlay a logo in the center of the QR code.
Why doesn't my QR code work with dark backgrounds?
QR scanners expect dark modules on a light background. If you invert the colors (light on dark), some scanners may still read it but many won't. For dark backgrounds, set a light foreground and very dark background — but always test with your target scanner before printing.
How much data can a QR code hold?
This generator supports up to ~500 characters (version 1–10 QR codes). Full QR codes (version 40) can hold up to 4,296 alphanumeric or 2,953 binary bytes. Longer content makes the QR denser and harder to scan — keep URLs short or use a URL shortener for best results.