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QR Code Generator FAQ — Create, Customize & Use QR Codes
Answers about QR codes: how they work, data limits, customization, error correction, and practical use cases.
Q1 How do I create a QR code?
Type your URL or text into the QR Code Generator and download as PNG. No signup required, works in your browser.
Q2 How do QR codes work?
QR codes use a 2D matrix of black and white squares to encode data. Scanners read the pattern using finder patterns for orientation and Reed-Solomon error correction for reliability.
Q3 How much data can a QR code hold?
Max: 7,089 digits (numeric), 4,296 characters (alphanumeric), 2,953 bytes (binary). Keep under 300 characters for reliable scanning.
Q4 What data types can QR codes encode?
URLs, text, email (mailto:), phone (tel:), SMS, WiFi credentials, vCard contacts, geolocation. Most phone cameras auto-detect the type.
Q5 What is QR code error correction?
Four levels using Reed-Solomon codes: L (7%), M (15%), Q (25%), H (30%). Higher levels allow scanning damaged codes but reduce capacity. Level H enables logos.
Q6 What size should a QR code be?
Minimum 2cm for close-range scanning. For distance: 10:1 ratio (1 meter distance = 10cm code).
Q7 Can I add a logo to a QR code?
Yes, using high error correction (level H). Keep logo under 30% of QR area. Always test scanning after adding.
Q8 Are QR codes free?
Yes. QR codes are an open standard (ISO/IEC 18004). The QR Code Generator creates them free for any use.
Q9 Static vs dynamic QR codes?
Static: data encoded permanently. Dynamic: encodes a redirect URL that can be changed later and tracked. Static is simpler; dynamic requires a service.
Q10 Can QR codes expire?
Static QR codes never expire. Dynamic codes expire if the redirect service is discontinued.
Q11 How do I scan a QR code?
Most smartphones scan natively with the camera app. iPhone: iOS 11+. Android: Camera app or Google Lens. No third-party app needed.
Q12 Can QR codes be colorful?
Yes, with guidelines: maintain high contrast, dark on light, no inverted colors, 70%+ contrast difference. Test on multiple devices.
Q13 How do I create a WiFi QR code?
Format:
WIFI:T:WPA;S:NetworkName;P:Password;;. Generate with the QR Code Generator. Phones auto-prompt to join.
Q14 Business uses for QR codes?
Menus, payments, product packaging, business cards (vCard), event tickets, marketing campaigns, inventory tracking, 2FA setup, WiFi sharing.
Q15 How to generate QR codes in JavaScript?
npm qrcode:
QRCode.toDataURL('https://example.com'). For Canvas, SVG, or file output.
Q16 How to generate QR codes in Python?
import qrcode; qrcode.make('https://example.com').save('qr.png'). Customize with QRCode class.
Q17 Are QR codes secure?
QR codes are just data carriers. Risks: malicious URLs, code swapping attacks. Always check URLs before opening.
Q18 QR code vs barcode?
Barcodes are 1D (20-25 chars). QR codes are 2D (up to 7,089 chars), scan from any angle, include error correction.
Q19 How do I track QR code scans?
Use UTM parameters in the URL and track in Google Analytics. Or use a dynamic QR service or URL shortener with analytics.
Q20 Print format for QR codes?
PNG at 300 DPI for print, SVG for scalable. Quiet zone (white border) must be 4+ modules wide. Test scanning the printed code.
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