# Why use a QR code?

> A QR code is worth using when it removes typing at a moment when typing is the obstacle: joining WiFi, paying at a counter, opening a menu, saving a contact. It is not worth using where a tappable link already exists, or where the audience is moving.

Source: https://useqr.app/docs/basics/why-use-qr-codes · Last reviewed 2026-08-21 · UseQR is free forever, MIT licensed, no signup.

---

## The honest case for QR codes

A QR code does exactly one thing well: it moves a string from a physical surface into a
phone without anyone typing it. Every genuine use case is a version of that.

**Strong cases:**

| Situation | What it replaces |
|---|---|
| Joining guest WiFi | Reading a 16-character password aloud |
| Paying at a counter | Typing an account number or handing over a card |
| Reading a menu | Reprinting when prices change |
| Saving a contact | Typing a name, number and email |
| Opening a specific product page in a shop | Searching and hoping |
| Confirming a specific asset in the field | Typing a serial number |

**Weak cases:**

| Situation | Why it fails |
|---|---|
| A code on a website | The user is already on a device; give them a link |
| A roadside billboard | Nobody scans while driving |
| A code with no stated reason | "Scan me" is not a reason |
| A code in an email | An email is already tappable |
| A code as the only route to essential information | Excludes anyone without a phone |

## What actually determines whether it works

In rough order of effect:

1. **Dwell time.** Is the person standing still? A code in a lift lobby beats one in a
   corridor by an order of magnitude.
2. **A stated reason.** "Scan for the wine list" beats "Scan me".
3. **Size for the distance.** Printed width should be at least the scanning distance divided
   by ten. Most codes are far too small.
4. **What happens next.** A slow or irrelevant landing page does not just waste that scan;
   it makes the person less likely to scan the next code they see.

## What a QR code cannot do

It cannot track anyone by itself, cannot install anything, cannot dial or pay without
confirmation, and cannot change what it points at once printed — unless it points at a
redirect you control. Understanding those limits is what separates a code that works from
one that is decoration.

## FAQ

### When is a QR code the wrong choice?
On a website, in an email, on anything moving, and anywhere the audience cannot stop. Also as the only route to essential information, because that excludes people without a phone or data.

### What makes people actually scan a code?
Standing still, and a stated reason. Dwell time and a specific benefit outweigh every design decision, including the size and styling of the code itself.

### Do QR codes track me?
A static QR code contains only text and cannot track anything. The website it opens can track you exactly as any website can, and a dynamic code's provider records every scan.

### Are QR codes better than NFC?
They are cheaper, work on every phone with a camera, and can be printed on anything. NFC is faster and needs no camera, but requires a chip in every item and is not readable from a distance.

## Try it

- https://useqr.app/wifi
- https://useqr.app/upi
- https://useqr.app/menu
- https://useqr.app/vcard