使用结果前如何检查？
识别器处理本地图片，不提供实时摄像头扫描，每次返回一个解码结果。多码图片可裁剪为单码，但应保留空白边缘；识别不会自动打开目标地址。
QR Code Scanner可以处理什么？
QR Code Scanner 用于在浏览器中检查数据，并清楚显示处理结果和限制。 已核对的功能： 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.
如何使用？
- 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.
实际输入输出示例
Read a URL from a QR image
输入
PNG image containing a QR code for https://kitlumi.com/输出
https://kitlumi.com/The output is the encoded payload exactly as decoded; scanning does not visit the URL.
常见错误与修复方法
| 现象 | 可能原因 | 修复方法 |
|---|---|---|
| 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
该工具的实际边界： Treat decoded links as untrusted until you inspect their destination.
标准与实现参考
- 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.
关于QR Scanner的常见问题
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.
更新记录
本次实质更新： 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. 2026-10-15：补充结果检查步骤和具体能力边界。