QR Code Scanner は何をしますか？
QR Code Scanner はブラウザ上でデータを調査するツールで、結果と制限を明確に示します。 検証済みの機能： Image-based QR scan, Normal and inverted codes, No camera permission, Local decoding.
Image scanning avoids camera permission
Use this page when the QR code already exists in a screenshot or file. A live camera scanner is faster for printed codes but requires camera permission and a separate privacy decision.
使い方
- Choose a local image that contains one clear QR code.
- Select Scan QR code; the page checks normal and inverted pixels without requesting camera access.
- Read and copy the exact payload before deciding whether to open a decoded URL.
実際の入出力例
Read a URL from a QR image
入力
PNG image containing a QR code for https://kitlumi.com/出力
https://kitlumi.com/The output is the encoded payload exactly as decoded; scanning does not visit the URL.
一般的なエラーと対処
| 症状 | 原因 | 対処 |
|---|---|---|
| No QR code was found. | The image is blurred, too small, cropped through the quiet zone, low contrast, or heavily distorted. | Use a sharper image with the full code and clear light margin visible. |
| The result is a suspicious or unexpected link. | A QR code can encode any text and does not authenticate its creator. | Inspect the complete hostname and scheme; do not open or sign in through an untrusted destination. |
Important behavior of QR Scanner
このツール固有の制限： Treat decoded links as untrusted until you inspect their destination.
標準と実装の参考資料
- jsQR official repository (opens in a new tab)Documents the QR decoder used for normal and inverted image data.
- MDN — ImageData (opens in a new tab)Documents the pixel buffer supplied to the decoder.
QR Scanner — FAQ
Does the QR Scanner upload my input?
No. Processing runs in the current browser tab, and the page does not send tool input to a KitLumi processing endpoint.
What input does the QR Scanner accept?
It accepts a local JPEG, PNG, WebP, or AVIF image containing a QR code. The workspace checks the input and reports malformed or unsupported values before it produces a result.
What does the QR Scanner produce?
It produces the exact decoded QR payload and detected QR version. Copy and download controls appear when the output format supports them.
What limitation should I know?
Treat decoded links as untrusted until you inspect their destination.
更新内容
実質的な更新： QR Scanner: Added Image-based QR scan, Normal and inverted codes, No camera permission, Local decoding, responsive controls, explicit runtime disclosure, and task-specific examples and limitations.