QR Code Scanner

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QR Code ➡️ String
Result

QR Code Scanner is a tool to read (convert) QR code to string.

Input and buttons:

  • We can use a QR code image file as the input.
  • Or a clipboard of a QR code snapshot as the input — using CTRL + V or use mouse right-click ➡️ contextmenu ➡️ Paste.
  • Or camera (webcam) as the input. Simply click ðŸŽĶ CAMERA button to activate it. Remember to allow the camera usage in the camera permission prompt. If we have multiple video input devices, we can choose it using the select element — initially, it will use the default webcam set by the operating system. If there's no webcam on your terminal (machine), well. ðŸĪ·
  • For camera input, once a frame is detected to contain a valid QR code and successfully translated to string, the video will be paused — thus, we can copy the string. We can continue scanning by hitting ▶️ SCAN button.
  • To switch back to file or clipboard input, hit ðŸ’ū FILE/CLIPBOARD button.
  • Hit 🗑️ RESET to clear the output.

Output:

  • It's beneath the application — titled QR Code ➡️ String.
  • If it's a valid QR code, we can click or tap the result to automatically copy it to our clipboard.

Limitation

The limitation of @zxing/library (client side — with CDN) compared to its original Java-based Node.js port lies in reduced image pre-processing and barcode localisation robustness, making it more prone to failure on low-contrast, skewed, or noisy inputs.