“A QR reader (eq. for Quick Response code) is a specific matrix barcode (or two-dimensional code) that is readable by special QR barcode readers or cam smartphones. The code consists of black modules arranged in a rectangular pattern on a white background. The data encoded may be text, URL, etc.” (Wikipedia)
This website provides an online QR Code reader directly in your web browser.
Unlike other solutions, this website provides an online way to read QR Codes as no software installation is required.
This implementation is based on the ZXing cross-format 1D/2D barcode image decoding library coded in Java.
The QR Codes are created with the Google Chart Tools.
The source code of the QR Code reader is on GitHub (https://github.com/blockchain/jsqrcode).