QR codes — Explainer
What is a QR code — and do you need one?
What QR codes are, how they work, the smartest ways businesses use them today, and the mistakes and scams to avoid.
Quick answer
- A QR code is a square, two-dimensional barcode that any modern phone camera can scan.
- It can open a web page, join a WiFi network, save a contact, start an email or text, and more.
- You need one if people meet your business offline — on print, packaging, signs or at events — and you want them to take a next step online.
- Use static codes that never expire, and add UTM tracking so you can measure scans.
What is a QR code?
A QR (Quick Response) code is a two-dimensional barcode made of black and white squares. It was invented in 1994 by Denso Wave to track automotive parts, and it's now one of the most common ways to connect something physical to something digital.
The big difference from a regular barcode is capacity. A standard retail barcode holds a dozen or so digits; a QR code can hold up to about 7,000 digits or 4,000 characters — enough for a long web address, a full contact card or WiFi login details.
How QR codes work
Every iPhone and Android phone can scan QR codes with its built-in camera — no app required. Point the camera at the code, tap the link that appears, and the phone does the rest.
A QR code can be set up to:
- Open a website — the most common use, from menus to product pages.
- Join a WiFi network — guests scan instead of typing a password.
- Save a contact — a vCard code adds your details straight to someone's phone.
- Start an email, text or call — with the recipient and message filled in.
- Play a video — see how to make a QR code open a video.
Do you need a QR code?
If customers ever see your business somewhere other than a screen, probably yes. QR codes are worth it when you want someone to take an action you can't fit on paper — watch a demo, book a call, see a menu, leave a review, or claim an offer.
They're less useful where people are already online. Don't put a QR code in an email or on a web page — a regular link works better there.
Make a QR code in a minute
Free, no sign-up, never expires — with built-in scan tracking.
Smart ways to use QR codes in marketing
Print materials and direct mail
Flyers, brochures and postcards can only say so much. A QR code takes readers to a video, a mobile-friendly landing page or an offer they can act on immediately.
Signs, windows and billboards
Use a code to extend a sign with a deeper story or a discount. Size matters: make the code roughly one-tenth of the scanning distance, and keep it at eye level when you can.
Business cards and name badges
A vCard code saves your details to a contact's phone in one scan — or link to a page about you and your services.
Packaging and products
Link to setup guides, reorder pages, warranty registration or recipes. Packaging is one of the highest-intent places for a QR code.
Reviews and referrals
A code at the checkout counter or on a receipt that opens your Google review page is one of the simplest ways to get more online reviews.
Events, trade shows and real estate
Put codes on booths for demos and sign-ups, and on property signs for virtual tours and listings.
Common QR code mistakes
- No reason to scan. Add a call to action: "Scan for the menu" or "Scan for 10% off."
- Too small or low contrast. Keep codes at least 2 cm (0.8 in) square, dark on light.
- Sending people to your homepage. Link to a page made for that placement.
- No tracking. Without UTM parameters, scans blend into your other traffic in Google Analytics.
- Codes that expire. Some "free" generators make dynamic codes that stop working when a trial ends. Use static codes or a service you'll keep paying for.
QR code safety
Scammers sometimes stick fake QR codes over real ones — on parking meters, for example — to steal payment details. Protect your customers by printing codes directly onto materials rather than using stickers, checking public codes regularly, and always pointing codes to your own domain so the address people see after scanning is one they recognize.
Frequently asked questions
Do I need an app to scan a QR code?
No. The built-in camera on modern iPhones and Android phones scans QR codes automatically.
Are QR codes free?
Yes. Static QR codes are free to create and never expire. You only pay if you want dynamic codes that can be edited after printing.
Can I track how many people scan my QR code?
Yes. Add UTM parameters to the link — our QR code generator does this automatically — and scans appear in Google Analytics 4.
How much information can a QR code hold?
Up to about 7,000 digits or 4,000 characters. In practice, shorter content makes a simpler code that scans faster and more reliably.