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About QR Scanner Tool - Scan QR code with webcam

Today, QR codes can be seen in newspapers, magazines, flyers, posters, etc. You can easily spot the QR codes around you. It lets you interact with the world by using your smartphones, tablets, or computers.

Every year, a large portion of the $5.5 trillion payments made via mobile went through a QR code on various apps in China.

What is a QR code?

QR code means "Quick Response." It's a two-dimensional bar code readable by smartphones, tablets, and computers(having a webcam facility).

The QR code contains information accessible along two dimensions: horizontal and vertical. It has black squares and dots with various hazy patterns arranged in a squared grid on a white background. The information is extracted from those fuzzy patterns.

QR Codes may contain links (to websites, videos, or files), email addresses, text, phone numbers, vCards, and more.

Denso Wave invented the QR code in 1994. However, after its invention, it got famous because of its ability to store many data. You can encode 4296 alphanumeric characters in a single bar code.

What is a QR scanner or QR code reader?

A QR code scanner or QR code reader is an optical scanning device able to read QR codes. Most smartphones and tablets have built-in QR code scanners in their cameras. However, to scan the QR code from pc, you need a webcam. That means that you can point your camera to a QR code and be able to scan and read it.

When you scan a QR code, you get immediate access to its content. The QR code reader can act on scanning the QR code, like opening the website URL in your browser. Other actions might include storing the business card in your smartphone's business list, connecting to wireless, or perform any other action specified to that QR code.

How to use a QR scanner?

Most smartphones and tablets have built-in functionality to scan the QR code. However, you can also download the apps available online for that purpose.

But, when scanning the QR code from a PC, it feels a little bit odd. But sometimes you have to do this. It doesn't make any sense to pull out your smartphone or tablet to scan a QR code from your computer's screen and view it on the tiny device—especially when you have the big screen right in front of you.

How to scan a QR code?

For scanning a QR code from your PC, the process is simple. Perform the following steps.

  • Open the QR Scanner - QR Code Reader.
  • The tool allows you to either upload the image or uses the webcam (attached to your PC) to scan the QR code.
  • Point the webcam at the QR code to be scanned, and you're done.

When you scan a QR code with us, you will be asked to give our QR code scanner permission to access the webcam on your PC.

What if the QR Code is not working?

There can be several reasons why our QR code reader is unable to read the code.

  • Suppose you generated the QR code by yourself. Check the entered data. Sometimes there are minor mistakes in the URL typing that damage the QR code.
  • Most QR codes contain a lot of information. Try to reduce that. It helps the QR code scanner to read the data in a better way.
  • Remove the logo from the QR code and check if its help.
  • The foreground must be darker than the background in the QR code. It is highly recommended to have the QR code in black color, with white background.
  • Check the QR code size—the scanning distance and amount of data to be encoded matter.

How do I calculate the right size for my QR Code?

The formula to know the ideal size concerning scanning distance is.

QR Code Size (width in inches or cm) = Scanning distance (in inches or cm) ÷ 10

Suppose you want a QR code for the flyer, and the distance between the flyer and the scanning device is 12 inches (one foot). Then the QR code minimum size will be 1.2 inches.

The formula to know the ideal size concerning the amount of data to be encoded is.

QR Code Size (width in inches or cm) = (Scanning distance (in inches or cm)* Number of rows and columns) /250

Here, the number of rows and columns of modules is determined by the Version Number.

  • Version 1 has 21 rows and 21 columns of modules.
  • Version 2 has 25 rows and 25 columns of modules.
  • ...
  • Version 40 has 177 rows and 177 columns of modules.

Version Number ranges between 1 to 40.

Usually, a dynamic vCard QR code has about 33 rows and columns of data. And if the scanning distance is 0.5 feet or maybe 6 inches. Then the QR code minimum size will be 0.8 inches.

Can a QR Code be hacked?

No one can hack the QR code. There are no security flaws—however, it's possible to replace the QR code with another. Users would think that they are scanning the QR code of a trusted company, but it leads them to malicious content.

Or to create a QR code that leads to phishing or malicious content.

You must be careful before scanning the QR code. So you do not be the victim of these malicious contents.

Take the following measures to increase your QR code security.

  • Do not scan the QR code if you have any doubts.
  • Before scanning the QR code, ask yourself if the company looks legitimate or the code design looks professional.
  • Most of the QR code readers now display the link address before opening it in a web browser. Check the landing page, make sure that the URL of the landing page looks authentic.
  • Check for tempering. Is the QR code on the flyer, product, newspaper, or magazine part of the original design? Or is it a sticker placed on the top?

How to create a QR code?

Perform the following steps to create the QR code.

  1. Go to QR Code Generator Tool.
  2. Provide all the necessary information needed to create a unique QR code. You can generate the QR code for a website, business, products, services, or private use.
  3. Select the image size. It is highly recommended to use 250 x 250 pixels.
  4. Select the error correction level.
  5. After filling in all the needed entries, click the "Generate" button.
  6. The tool will process the request and generate the QR code.
  7. You can either download the QR code or use the code snippet to integrate it on your website.