What is a QR code and how does it work?

QR Code

Written by Alex

Over the years, we have seen a variety of different codes being placed on products, however, invented in 1994, the QR code is the most popular of them all. Nowadays, we see QR codes being used in almost every other thing, restaurants, fast food places, brochures, trophies, headstones, business cards, and even NFT’s have them, and we actively use these.

The small-sized QR code holds up a lot of information and creates great space and time utility for us, thus making it a great invention. While we keep using QR codes in different walks of life, almost nobody ever stops and thinks about how QR codes work. But if you are here, then you are a curious person, and in this article, we will give a detailed answer to your questions.

What Exactly is a QR Code?

Invented in Japan in 1994, the QR (Quick Response) code is a matrix barcode that was designed to be a code that holds information and can respond to the user quickly. Also known as two-dimensional barcodes, these codes are generated using different QR code generators such as Replay Vault.

The QR codes being much simpler and more effective than the codes before it, allows users to simply scan them by using their mobile phones. Nowadays, millions of businesses and individuals use QR codes for different purposes daily.

How Does a QR Code Work?

We know that a QR code is basically a piece of code designed to hold bring you to a particular piece of information; thus, the QR code we see is basically a representation of that information. The black dots on the QR code are the pieces of stored information, whereas the white dots are empty pieces. This information can be stored inside these black dots can be in numeric, alphanumeric, or binary form; thus, it can only be understood by machines.

Once you use your mobile phone to scan a QR code, your mobile phone first interprets this information inside the QR code and then converts it into a human language so that you can easily understand it.

This simple design and concept of storing information inside the black dots make the response time of QR codes really fast, thus resulting in it being used all over the world.

What Are the Different Types of QR Codes?

While it’s not common information, there are actually two different types of QR codes out there.

Static QR Codes:

Anything termed static is characterized as immovable or unchangeable, and that’s precisely the case with static QR codes. We know that we can store a piece of information such as a link or media on a QR code. When this piece of information gets stored onto a static QR code, it is impossible for you to change or remove that information.

This makes Static QR codes a one-time use QR code that is not suitable for use in things such as business cards, brochures, and advertisements. However, they can be used for things such as your website, email, or social media link.

Dynamic QR Codes:

Anything that is constantly changing or can be easily changed is termed as dynamic, and that is exactly what dynamic QR code is. Dynamic QR code, like static codes, can store different pieces of information quickly. However, once a piece of information gets stored onto dynamic code, it can easily be edited, changed, and deleted, thus putting the controls in your hand.

With dynamic QR codes being editable, so you can update its content, they become the perfect fit for things such as business cards, marketing campaigns, and brochures.

Generating a dynamic QR code is comparatively more expensive than a static one; however, Replay Vault allows you to generate endless free dynamic QR codes while only paying for the storage space you take up.

What Things Should I Look for in a QR Code?

Now that you know what QR codes are and how they work, it is also essential to understand the qualities upon which you can distinguish the difference between a good QR code and a bad QR code. Knowing this will help you always get the best QR codes for your needs. To help you identify good QR codes, we have jotted down the things that you should look for in a QR code.


Whenever you generate a QR code from a good QR code generator such as Replay Vault, you will always get the option of customizing your QR code; this will allow you to get rid of that boring and dull QR code look and have a QR code that looks appealing and personalized. Look for these features:

QR code with logo

Unlimited QR Codes

QR codes for social media

Fast Working:

QR codes that are not generated by a trusted and fast generator can often be slowed down after they get loaded with heavy amounts of information. To avoid having a QR code that works slowly, you should always use a trusted QR code generator and make sure that scanning the QR code on your iphone or Android is easy.

Allows to Add All Sorts/Formats of Information:

When generating QR codes, it is essential for you to make sure that the QR code generator would allow you to publish all forms of media and information, this includes text, photos, and even videos. Replay Vault is a QR code generator that lets you do so.

Having a QR code that allows all formats of media and information make your QR codes much more powerful and effective thus, those are the ones you should go with.


QR codes are the future, and it’s essential to stay updated and learn about the future. We hope this article added value and increased your knowledge about QR codes, making you understand how QR codes work and other details about it.

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