How to Generate QR Codes for Your Business or Website

How QR Codes Work

A QR (Quick Response) code is a two-dimensional matrix barcode invented by Denso Wave in 1994. Unlike a traditional 1D barcode that encodes data in vertical bars, a QR code stores data in a grid of black and white squares, allowing much more information in a smaller space. A standard QR code can store up to 3,000 alphanumeric characters.

The code includes built-in error correction using Reed-Solomon codes, meaning it can be partially damaged or obscured and still scan correctly. The three large squares in the corners are "finder patterns" that allow any scanning software to locate and orient the code regardless of rotation angle.

Error Correction Levels

QR codes have four error correction levels, balancing storage capacity against resilience:

• L (Low): 7% of data can be restored — smallest code size, most data capacity
• M (Medium): 15% recovery — good balance for general use
• Q (Quartile): 25% recovery — better for outdoor or industrial environments
• H (High): 30% recovery — best for codes that will be printed on merchandise, embedded in logos, or exposed to wear

If you plan to overlay your logo on the QR code (a common branding technique), use H level error correction—your logo is essentially "damaging" part of the code, and high error correction ensures it still scans reliably.

QR Code Data Types and Formats

URL / Website Link

The simplest and most common use case. Encode a URL like https://zapynext.xyz. When scanned, the device opens the URL in its default browser. Always use HTTPS—most modern devices warn users about HTTP links from QR codes.

WiFi Network

A WiFi QR code uses the format: WIFI:T:WPA;S:NetworkName;P:Password;;. When scanned on Android or iOS, the user is prompted to join the network without typing the password. Ideal for restaurants, Airbnbs, offices, and events.

vCard (Contact Information)

Encodes a full contact card: name, phone, email, address, website, and more in the vCard 3.0 format. When scanned, the device prompts the user to add the contact to their address book. Great for business cards and trade show badges.

Plain Text

Encodes a plain text string—useful for short instructions, codes, or any information that doesn't need a URL scheme. Displays the text directly in the scanner app.

Email and SMS

Encodes a mailto: or sms: URI. When scanned, opens the user's email or messaging app pre-filled with the recipient and optional subject/body. Useful for feedback forms and support contacts on print materials.

Phone Number

Encodes a tel: URI, prompting the device to dial the number when scanned. Useful on business cards and menus for restaurants that take reservations.

QR Code Size Guidelines

Size matters because scanning software needs sufficient pixel density to decode the pattern. Rules of thumb:

• Minimum print size: 2 × 2 cm (0.8 × 0.8 in) for standard-density codes in ideal conditions
• Business card: 2.5 × 2.5 cm works well for close-range scanning
• Poster (viewed from 1 meter): At least 5 × 5 cm
• Billboard (viewed from 5 meters): At least 25 × 25 cm, and use a short URL to reduce code density
• Quiet zone: Leave a white margin of at least 4 modules (the smallest square unit) around all sides of the code—without this, scanners may fail to detect the code boundaries

Best Practices for Business QR Codes

• Use a URL shortener for long URLs: Shorter URLs produce less dense QR codes that scan faster and are more forgiving at small print sizes
• Add a call-to-action: "Scan to see our menu" or "Scan for 10% off" printed below the code dramatically increases scan rates
• Test before printing: Scan the code on multiple devices (iPhone, Android, different apps) before committing to a print run
• Use dynamic QR codes for campaigns: Dynamic codes point to a redirect URL that you can change without reprinting materials—useful for seasonal promotions
• Maintain contrast: The code must have high contrast between the dark modules and light background. Never use a dark background with light modules (inverted codes often fail to scan)

QR Codes for Digital Use

QR codes aren't just for print. Digital use cases include:

• Login flows: Desktop apps showing a QR code that the mobile app scans to authenticate (WhatsApp Web, banking apps)
• Contactless menus: Restaurants displaying QR codes on tables that open digital menus
• Two-factor authentication: TOTP setup in apps like Google Authenticator uses QR codes to transfer the shared secret
• Event ticketing: QR codes as unique, scannable tickets for events

Generate a QR code for your website, WiFi network, or contact card in seconds. Use ZapyNext's free QR Code Generator—customize size, error correction level, and download as PNG or SVG. No account, no watermarks, completely free.