What information can I encode in a QR code?

URLs, text, contact info (vCard), WiFi credentials, email addresses, phone numbers, SMS, geographic coordinates, payment info. Max capacity: 4,296 alphanumeric or 7,089 numeric characters.

How do QR codes work?

QR codes store data in 2D patterns of black/white squares. Smartphone cameras decode patterns instantly. Three corner squares help cameras orient and read code at any angle.

What size should I make my QR code?

Minimum 2×2 cm (0.8×0.8 inches) for smartphone scanning. Larger QR codes with more data need bigger size. Test scanning distance: size should be 10% of scanning distance.

Can QR codes expire or stop working?

Static QR codes never expire - data is embedded in code itself. Dynamic QR codes (linking to changeable URLs) can stop if service provider shuts down or subscription ends.

Tools Calculators

QR Code Generator

Create custom QR codes for URLs, website links, plain text messages, contact information (vCards), WiFi passwords, email addresses, phone numbers, and SMS. Generate high-resolution QR codes with customizable sizes, error correction levels, and download options for business cards, marketing materials, and digital sharing.

How to Use the QR Code Generator

Use the QR Code Generator to create custom QR codes for URLs, website links, plain text messages, contact information (vCards), WiFi passwords, email addresses, phone numbers, and SMS. Generate high-resolution QR codes with customizable sizes, error correction levels, and download options for business cards, marketing materials, and digital sharing.. Enter your values to get accurate, instant results tailored to your situation.

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QR Code Guide

Creation best practices

Expert Tips

QR Codes Store Limited Data: Typical capacity: 100-300 characters for reliable scanning. URLs, contact cards, and short text work best. Large data requires smaller error correction.
Higher Error Correction Enables Damage: QR codes function even with 30% damage at highest error correction level. Lower levels allow more data but less damage tolerance.
URL Shorteners for Long Links: Long URLs create dense QR codes that scan slowly or fail. Use URL shorteners to reduce QR complexity and improve scan reliability.
Test Before Mass Production: Scan QR code with multiple devices and apps before printing. Verify correct destination and reliable scanning from typical distances.

Essential Fundamentals — QR code basics

Data Capacity

Character Limits: Numeric: 7,000+ characters. Alphanumeric: 4,000+ characters. Binary: 2,900+ bytes. Practical limit lower due to scanning reliability.
Error Correction Levels: Low (7% damage), Medium (15%), Quartile (25%), High (30%). Higher correction means less data capacity but better damage resistance.

Common Uses

URLs: Most common use case. Shorten long URLs before encoding to reduce QR complexity and improve scan speed.
Contact Information: vCard format stores name, phone, email, address. Business cards, conference badges, marketing materials.
Plain Text: Product information, serial numbers, WiFi credentials. Keep under 100 characters for optimal scanning.

Advanced Strategies — Design optimization

Best Practices

Size & Contrast: Minimum size: 2cm × 2cm for smartphone scanning from 10cm. High contrast (dark on light background) essential for reliability.
Quiet Zone: White border around QR code (minimum 4 modules wide) prevents scanning interference from surrounding content.
Testing: Test with multiple devices (iOS, Android) and apps before mass production. Verify scanning from expected distance and angles.

Frequently Asked Questions

What information can I encode in a QR code?: URLs, text, contact info (vCard), WiFi credentials, email addresses, phone numbers, SMS, geographic coordinates, payment info. Max capacity: 4,296 alphanumeric or 7,089 numeric characters.
How do QR codes work?: QR codes store data in 2D patterns of black/white squares. Smartphone cameras decode patterns instantly. Three corner squares help cameras orient and read code at any angle.
What size should I make my QR code?: Minimum 2×2 cm (0.8×0.8 inches) for smartphone scanning. Larger QR codes with more data need bigger size. Test scanning distance: size should be 10% of scanning distance.
Can QR codes expire or stop working?: Static QR codes never expire - data is embedded in code itself. Dynamic QR codes (linking to changeable URLs) can stop if service provider shuts down or subscription ends.