QR code, according to wikipedia, is a type of barcode that consists of black modules (square dots) arranged in a square grid on a white background, which can be read by an imaging device (such as a camera) and processed using Reed–Solomon error correction until the image can be appropriately interpreted.
Users with a camera phone equipped with the correct reader application can scan the image of the QR code to display text, contact information, connect to a wireless network, or open a web page in the telephone’s browser.
While searching for best android qr code scanner app and how to scan QR code on Android without app, I stumbled on an article where I discovered that I can use Google Goggles app.
Google Goggles is an image recognition application created by Google that lets you search the web using photos that you’ve taken on your mobile phone. With Google Goggles you can also easily scan barcodes and QR codes by just hovering the phone camera over them.
Google Goggles Download and How To Use it To Scan QR Code
To start scanning QR codes using Google Goggles app, you have to download the app to your Android smartphone.
You can download Google Goggles from Google Play store here if your Android device is running Android 2.2 and above. To see which version of Android you’re running, go to Settings > About phone > Android version.
Once installed, launch the app, accept the default settings and hover the camera over any barcode. The app will detect the code, analyze and interprete it accordingly.
NB: Data connection is required to use Google Goggles.