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6 Jul 2023

What is QR Code And How Does It Work

QR codes are widely used for various purposes, such as marketing campaigns, product packaging, event tickets, payment transactions, and many more.


They provide a convenient way to share information or initiate specific actions quickly and easily by scanning the code with a compatible device.

What is QR code?

A QR code, short for Quick Response code, is a two-dimensional barcode that can be scanned and read by smartphones, tablets, or QR code readers. It was invented by a Japanese company called Denso Wave in 1994 and has become widely popular due to its ability to store a large amount of data compared to traditional barcodes.

QR codes consist of black squares arranged on a white background, often in a square shape. These black squares represent encoded information that can be read by QR code scanning devices. The information encoded in a QR code can include text, URLs, contact information, Wi-Fi network details, or other data types.

How to read a QR code or Scanning process for QR code:

When you scan a QR code using your smartphone's camera or a dedicated QR code reader app, the software analyzes the pattern of black and white squares and decodes the information embedded in the code. The scanning process involves the following steps:

  1. Launch a QR code scanning app or open the camera on your smartphone.
  2. Align the QR code within the camera frame. The app or camera should detect and focus on the code automatically.
  3. Once the QR code is in focus, the scanning software decodes the encoded information.
  4. The app or device displays the decoded information, which could be a website URL, a text message, or any other data type stored in the QR code.
  5. Depending on the decoded information, the app may perform various actions. For example, if the QR code contains a URL, the app may open a web browser and navigate to the corresponding webpage.

What is QR code generator?

You can generate QR code using QR code generator. To generate a QR code, you can use online QR code generator tools or libraries. Here's an example of how to generate a QR code using Python and the qrcode library:

import qrcode
# Create a QR code instance
qr = qrcode.QRCode(



# Add data to the QR code
data = "Hello, World!"

# Generate the QR code image
image = qr.make_image(fill_color="black", back_color="white")

# Save the image to a file

In this example, the qrcode library is used to create a QR code instance. You can customize parameters like version, error correction level, box size, and border according to your requirements. The add_data() method is used to add the desired data (in this case, "Hello, World!") to the QR code. Finally, the make_image() method generates the QR code image with specified fill and background colors, and the save() method saves the image to a file ("qr_code.png" in this example).

There are also online QR code generator websites available where you can input your data and generate QR codes instantly, such as qr-code-generator.com, qrstuff.com, or qr-code-generator.com. These websites often provide additional options for customization, such as color selection, logo embedding, and error correction levels.

Bar Code vs QR Code

Barcodes and QR codes are both types of codes used for encoding information, but they have some key differences:

  1. Data Capacity: Barcodes can typically store a limited amount of information, usually a series of numbers or alphanumeric characters. In contrast, QR codes can store much more data, including text, URLs, contact information, Wi-Fi network details, and more. QR codes have a larger capacity due to their two-dimensional structure, which allows them to store information horizontally and vertically.
  2. Code Structure: Barcodes are linear and consist of a series of vertical bars and spaces of varying widths. The data is encoded in the widths and patterns of these bars. QR codes, on the other hand, are two-dimensional and consist of a grid of black squares arranged on a white background. The data is encoded in the arrangement of these squares.
  3. Scanning Speed: Scanning barcodes requires a direct line of sight and can only be read by a barcode scanner or a specific barcode scanning app. QR codes, on the other hand, can be scanned from any angle and direction, making them more versatile and easier to scan. QR codes can be read by smartphones, tablets, or dedicated QR code readers using their built-in cameras.
  4. Error Correction: QR codes have built-in error correction capabilities, which means they can still be scanned and decoded accurately even if the code is partially damaged or obscured. Barcodes do not have error correction mechanisms, so if a barcode is damaged or obscured, it may not be readable.
  5. Applications: Barcodes are commonly used in retail for product identification, inventory management, and point-of-sale systems. QR codes have a wider range of applications and can be used for marketing, advertising, ticketing, payment systems, product information, and more. QR codes have gained popularity due to their versatility and ability to store various types of data.

Overall, QR codes offer more functionality and flexibility compared to traditional barcodes. They can store more data, be scanned from any angle, and have built-in error correction, making them a popular choice for a wide range of applications.

Best free QR code generator

There are several free QR code generator tools available that provide reliable and feature-rich services. Here are some popular options:

  1. QR Code Generator (qr-code-generator.com): This online tool allows you to create QR codes with various customization options, such as choosing the data type (URL, text, email, etc.), changing colors, adding a logo, and selecting error correction levels. It also offers the ability to track and analyze the performance of generated QR codes.
  2. QR Stuff (qrstuff.com): QR Stuff provides a free QR code generator with options for creating QR codes for URLs, text, email, phone numbers, Wi-Fi networks, and more. It offers customization features like color selection, error correction levels, and embedding images or logos into QR codes.
  3. QRCode Monkey (qrcode-monkey.com): This user-friendly online QR code generator allows you to create QR codes with custom designs. It provides a range of customization options such as colors, shapes, patterns, gradients, and logo embedding. It also supports different data types and provides a high-resolution download of the generated QR code.
  4. me (goqr.me): GoQR.me offers a simple and easy-to-use QR code generator. It allows you to create QR codes for various data types, including URLs, text, phone numbers, and SMS. The tool provides customization options for colors and error correction levels. It also allows you to download the generated QR code as a PNG image.

Remember to review the terms of service, privacy policies, and any limitations of the chosen QR code generator before using it to ensure it meets your requirements.

FAQ - Frequently Asked Question

What is full form of QR Code?

The full form of QR code is - Quick Response Code

Who invented the QR Code?

It was invented by a Japanese company called Denso Wave in 1994.

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Aashutosh Kumar Yadav

By Aashutosh Kumar Yadav

He is a PHP-based UI/Web designer and developer by profession and very interested in technical writing and blogging. He has been writing technical content for about 10 years and has proficient in practical knowledge and technical writing.


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