Barcode reader

Barcode reader


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Imagine this situation: you are at a trade fair and you see a booth advertising a new interesting product. You don't want to take all the advertising material home, but you still want to have all the information. This is where QR codes and QR code scanners come into play.

The Mystery of QR Codes

QR code, or "Quick Response code," is a type of two-dimensional (2D) barcode that looks like a puzzle of black squares on a white background. These codes were invented in Japan in the 90s to track parts in automotive production processes, but now you can find them everywhere.

One Code for Many Information

The magic of QR codes lies in their ability to contain a vast amount of information. Despite being small, they can store data such as text, URLs, contacts, calendar events, and even Wi-Fi connection information. This makes them versatile tools for data sharing.

Scanners: The Code Detectives

While QR codes hold secrets, QR code scanners are the digital detectives that reveal them. These are apps or features found in many modern smartphones. Just point your phone's camera at the QR code, and the application will do the rest. It scans the code and translates the information into concrete actions. For example, if the QR code contains a URL, the scanner will open it directly in your browser.

Creative Uses of QR Codes

QR codes are not just marketing tools. They can be used in many creative and useful ways. Here are some examples:

  • Tickets: many airlines send boarding passes as QR codes. It is convenient and saves time.

  • Restaurant menus: especially during the pandemic, restaurants have started using QR codes to offer customers a digital menu.

  • Contests and games: QR codes can be hidden in public places or online, and finding them can win prizes or solve puzzles.

  • Museums and exhibitions: QR codes can provide detailed information about artworks or exhibitions.

The Security of QR Codes

Although QR codes may seem harmless, it is important to treat them with caution. In some cases, criminals can replace a legitimate QR code with a malicious one. For example, they could replace a restaurant menu QR code with one that redirects to a phishing website. So before scanning a QR code, make sure it comes from a trusted source.

How QR Code Scanners Work

Using a QR code scanner is generally very simple:

  1. Open the application: Find the QR code scanning application on your device. It is often already pre-installed or can be found in your app store.

  2. Open the camera: Open your device's camera within the scanning application.

  3. Frame the QR code: Position the QR code in the center of the capture rectangle on the camera screen.

  4. Wait for the scan: The application should automatically detect and decode the QR code.

  5. Perform the action: Once the application has decoded the QR code, it will usually show you an action to take. For example, if it is a link, it may ask if you want to open it in your browser.


QR codes are small but powerful tools that have transformed our daily lives. Through their mysterious black and white designs, they connect us to information, resources, and virtual experiences in ways we never imagined. And as QR code scanners continue to improve and become an integral part of our devices, we can't help but wonder: what will be the next secret these codes reveal to us?