QRコードジェネレーター

テキストやURLからQRコードを生成

最終更新:

ツールについて

QR コードジェネレーターは URL・連絡先・Wi-Fi 設定・短いテキストを、スマートフォンのカメラで即座に読み取れる正方形のバーコードに変換します。メニュー・イベント受付・2 段階認証設定・支払いリンクなど、物理とデジタルをつなぐインフラとして広く使われています。

使い方

  1. Type or paste the content you want to encode (URL, text, contact info, etc.).
  2. Adjust the size slider to balance scanability and the space you have available.
  3. Click Generate to render the QR code in the preview panel.
  4. Test by scanning with your phone camera before publishing.
  5. Download the PNG and embed it on a poster, menu, slide deck, or web page.

主な使用例

  • Linking a printed menu directly to an online ordering page.
  • Sharing event Wi-Fi credentials so guests join without typing.
  • Generating a QR for a TOTP secret during 2FA setup.
  • Producing a vCard QR for business cards or conference badges.
  • Driving in-person traffic to a feedback survey or product page.
  • Adding a QR shortcut to a documentation page in slide decks.

よくある質問

Q. How much data can a QR code hold?

A. Up to ~4,296 alphanumeric characters at the highest density. In practice keep it short: shorter URLs scan faster from a distance and tolerate more damage.

Q. What error correction level should I use?

A. Level M (15%) is a good default. Level H (30%) is recommended if you plan to overlay a logo or print on a surface that may scuff.

Q. Can I track scans?

A. A QR encodes a fixed string. To track scans, point it at a short URL or analytics-aware redirect that you control.

Q. Why do some QR codes have rounded dots?

A. Cosmetic. The QR spec only requires square modules; many generators offer styled variants but very stylised codes can fail on older scanners.