QR Code: What It Is and How It Works for Loyalty
By Alva Chew · Updated
Definition A QR code is a square barcode that a phone camera reads in one scan and turns into a link or text. For QR code loyalty, the code sits at the counter, the customer scans it to join, and their points card opens on their phone with no app to download. The code only starts the sign-up, and the points do the work of bringing customers back.
What is a QR code?
A QR code is a square barcode made of black and white modules. A phone camera reads it and opens the link or text stored inside. The customer types nothing, which is why shops print one at the counter instead of asking people to enter a web address.
Masahiro Hara led the team at Denso Wave that released the code in 1994. QR stands for “quick response”. Denso Wave keeps the patent rights but has declared it will not exercise them, and the specifications are public, so anyone can create and print a code free of charge.
Source: Denso Wave, QR Code history, checked 5 November 2026.
What can a QR code hold?
The standard is ISO/IEC 18004, approved as an international standard in June 2000. A code can hold far more than a short link, but a loyalty code only needs one address.
| Content type | Maximum characters |
|---|---|
| Numeric | 7,089 |
| Alphanumeric | 4,296 |
| 8-bit binary | 2,953 |
| Kanji | 1,817 |
Source: Denso Wave, QR Code standards, checked 5 November 2026. Symbols range from 21 by 21 to 177 by 177 modules.
Why do QR codes still scan when they are scuffed?
Every code carries error correction, so a camera can rebuild data from a damaged or dirty code. There are four levels, and the maker picks one when the code is generated.
| Level | Share of codewords that can be restored |
|---|---|
| L | About 7% |
| M | 15% |
| Q | 25% |
| H | About 30% |
Source: Denso Wave, QR Code standards for L and H, and error correction for M and Q, checked 5 November 2026. Denso Wave says Level M is the one most often chosen.
For a printed counter sign, a higher level gives you room for wear, glare and a small logo.
How does QR code loyalty work?
QR code loyalty uses the code as the front door to your digital loyalty card. The flow takes a few seconds:
- You display the code at the till, on the receipt or on a table card.
- The customer scans it with their phone camera.
- They enter their email address and the card is created.
- Staff add points after each purchase, in proportion to the amount spent.
Because the camera is already on the phone, the customer installs nothing. That is the main reason a QR code suits a loyalty card with no app download. The code can also lead to an add-to-wallet prompt, as described under digital wallet pass.
Where should the code go?
Put it where the customer is already waiting, with a short line of text that says what they get. The counter launch guide covers how to ask at the till.
- At the till, at eye height, where the queue stands.
- On the receipt or order slip, for customers who forgot to ask.
- On table cards, if you serve at tables.
Print it large enough to scan from arm’s length, keep a clear margin around it, and test it on both an iPhone and an Android phone before you print a batch.
Does a QR code make a loyalty programme work?
No. The code removes friction at sign-up, nothing more. Customers come back because the points are easy to understand: spend, earn, redeem. Stamps, tiers and vouchers add rules the customer must learn, so a points balance is the simpler reward behind the same code.
QR codes and Gimify
Gimify members join by scanning a QR code and entering their email, with no form, no app download and no password. Their card lives in Google Wallet with a live points balance, and staff add or redeem points on any phone at the counter. The free plan covers one outlet with unlimited members.
Questions owners ask
What is a QR code?
A two-dimensional barcode made of black and white squares. A phone camera reads it and opens the link or text stored inside, so the customer types nothing.
How does QR code loyalty work?
You display a code at the till. The customer scans it, enters an email address and gets a loyalty card on their phone. Staff then add points after each purchase.
Do customers need an app to scan a QR code?
Most phone cameras read QR codes without an app. The code can open a web page or an add-to-wallet prompt, so no separate app is needed.
Is a QR code free to use?
Yes. Denso Wave, the company that created it, holds the patent rights but has declared it will not exercise them, and the specifications are public.
What does QR stand for?
Quick response. Denso Wave chose the name because the code was designed to be read at high speed.
Can a damaged QR code still scan?
Often yes. QR codes carry error correction that can restore part of the data, with a level you choose when the code is made.
Read next
Start free
Gimify is free for one outlet with unlimited members and no time limit. Unlimited outlets are one flat monthly price.
See plans