QR codes had a rocky start. For years they were mostly ignored, a solution looking for a problem. Then the pandemic arrived, and suddenly everyone knew how to scan one.

Now QR codes are everywhere: menus, payments, event tickets, product packaging, business cards. Understanding when and how to use them well is increasingly valuable.

How QR codes work

QR (Quick Response) codes are two-dimensional barcodes that encode data visually. Unlike traditional barcodes that encode in one direction, QR codes use both horizontal and vertical patterns, storing more information in less space.

Key characteristics:

Data capacity: Up to 4,296 alphanumeric characters
Error correction: Can be read even if partially damaged
Fast scanning: Designed for quick camera recognition
Orientation independent: Works at any rotation

What QR codes can encode

URLs (most common)

Direct users to websites, landing pages, or apps:

https://example.com/menu
https://example.com/download-app

Plain text

Simple messages without internet:

Product: Widget Pro
Serial: WP-12345
Warranty: 2 years

WiFi credentials

Auto-connect to networks:

WIFI:T:WPA;S:NetworkName;P:password123;;

Users scan and join without typing passwords.

vCards (contact information)

Add contacts directly:

BEGIN:VCARD
VERSION:3.0
FN:John Doe
TEL:+1-555-123-4567
EMAIL:john@example.com
END:VCARD

Email

Pre-filled email composition:

mailto:support@example.com?subject=Help%20Request

Phone numbers

Direct dial:

tel:+1-555-123-4567

SMS

Pre-filled text message:

sms:+1-555-123-4567?body=Subscribe

Geographic coordinates

Open maps to a location:

geo:37.7749,-122.4194

Calendar events

Add events to calendar:

BEGIN:VEVENT
SUMMARY:Meeting
DTSTART:20260415T100000
DTEND:20260415T110000
END:VEVENT

Practical applications

Business cards

Include a QR code that adds your contact information:

Saves typing
Makes sure details are accurate
Can include more details than the card itself

Product packaging

Link to:

Instructions or manuals
Warranty registration
Authenticity verification
Customer support

Restaurant menus

Post-pandemic standard:

Always up-to-date
No printing costs for updates
Fewer physical touchpoints

Event tickets

Digital tickets as QR codes:

Easy to distribute
Hard to forge (with proper implementation)
Quick scanning at entry

Marketing materials

Print ads, posters, flyers:

Connect print to digital
Track campaign effectiveness
Provide more information than print allows

Payments

Mobile payment systems use QR codes for:

Point-of-sale transactions
Peer-to-peer transfers
Invoice payments

Authentication

Two-factor authentication setup:

TOTP (Time-based One-Time Password) provisioning
App-to-app linking

QR code design best practices

Size matters

Minimum size depends on:

Scanning distance
Print quality
Error correction level

Rule of thumb: Minimum 2cm x 2cm for close-up scanning. Larger for posters or billboards.

Contrast is critical

QR codes need high contrast to scan reliably:

Dark pattern on light background (classic)
Light pattern on dark background (inverted, works but less common)
Avoid low-contrast color combinations

Error correction levels

QR codes have four error correction levels:

Level	Recovery	Use case
L (Low)	~7%	Maximum data capacity
M (Medium)	~15%	Standard use
Q (Quartile)	~25%	When logo overlay planned
H (High)	~30%	Harsh environments

Higher error correction means less data capacity but more resilience.

Adding logos

You can place a logo in the center of a QR code if:

Error correction is Q or H
Logo covers less than the recoverable area
Contrast is still sufficient around edges

Quiet zone

Leave white space around the QR code:

Minimum 4 “modules” (the small squares)
Helps scanners identify boundaries
Don’t let other design elements touch it

Don’t over-customize

Heavily stylized QR codes can fail to scan:

Rounded corners: Usually fine
Gradient colors: Can reduce contrast
Pattern modifications: Risky
Unusual shapes: May not scan

Test thoroughly before printing.

Testing QR codes

Multiple devices

Different cameras and apps have varying capabilities:

iOS Camera app
Android Camera app
Dedicated scanner apps
Various phone models (old and new)

Multiple conditions

Test in:

Good lighting
Low lighting
Different angles
Various distances

Before printing

Always test the exact file that will be printed:

Export at final size
Print a test copy
Scan from actual printed material

Static vs dynamic QR codes

Static QR codes

The URL is encoded directly in the code:

Works forever
No tracking capability
Cannot be changed after printing

Dynamic QR codes

Encode a redirect URL that you control:

Can change destination anytime
Enable tracking (scans, location, time)
Require ongoing service/hosting

Dynamic QR codes are useful for campaigns where you might need to update the destination.

Creating QR codes

Our QR code generator

The QR Code Generator creates codes for:

URLs
Plain text
WiFi credentials
vCards
Email
Phone numbers
SMS

It includes:

Customizable colors
Size options
PNG and SVG download
Error correction selection

It’s free and runs in your browser, so no data is sent to servers.

Considerations for print

When generating for print:

Use SVG format (scales infinitely)
Make sure minimum size is appropriate for scanning distance
Verify contrast in final design
Always test before mass printing

QR code mistakes to avoid

Linking to non-mobile-friendly pages

Users scan with phones. If the destination isn’t mobile-optimized, you’ve wasted the interaction.

No value proposition

Why should someone scan? Make it clear:

“Scan for menu”
“Scan to download”
“Scan for 10% off”

Broken or wrong URLs

Test every code before printing. A wrong URL in 10,000 printed flyers is expensive.

Tiny codes on large surfaces

A billboard needs a larger QR code than a business card. Consider scanning distance.

No fallback

Include the URL as text for:

Accessibility
Users who prefer typing
When scanning fails

Tracking QR scans

URL parameters

Add UTM parameters to track in analytics:

https://example.com/page?utm_source=qr&utm_medium=print&utm_campaign=summer2026

URL shorteners with analytics

Use services like Bitly that provide:

Scan counts
Geographic data
Time-based analytics

Dynamic QR services

Dedicated QR platforms give you detailed analytics, but add dependency and cost.

Take action

Identify a use case for QR codes in your business
Create a code with QR Code Generator
Test on multiple devices
Make sure the destination is mobile-friendly
Track performance with analytics

For help with QR code campaigns or print-to-digital strategy, reach out.