What is QR code error correction?

Error correction determines how much damage a QR code can sustain and still be readable. L level recovers 7%, M recovers 15%, Q recovers 25%, and H recovers 30% of data. Higher levels make the QR code more complex but more fault-tolerant. Use H level if the QR code will be printed or potentially obscured.

How do I use a WiFi QR code?

Select the WiFi format, enter the SSID and password, then generate the QR code. Scan it with your phone's camera — the device will automatically detect the WiFi info and prompt to connect, no need to manually enter the password. Great for sharing guest WiFi.

How much data can a QR code store?

A QR code can store up to approximately 4,296 alphanumeric characters or 7,089 numeric characters. However, more data makes the QR code denser and harder to scan. Keep content concise, especially for small media like business cards. For URLs, use a short link.

Do generated QR codes expire?

QR codes themselves never expire — they encode text information as a graphic pattern. However, the content they point to (like a web link) may become invalid. This tool generates QR codes entirely in your browser, no online service dependency, so they are permanently valid.

QR Code Generator

Generate QR Codes Online

Input Content

QR Code Generator Guide

Key Features

Multi-format Support - Text, URL, Email, Phone, WiFi
Custom Styling - Adjust size, colors, error correction level
Real-time Preview - Instant QR code generation as you type
Export Options - Download PNG or copy to clipboard

Use Cases

Share web links
Quick WiFi connection
Exchange contact info
Product information display

QR Code Generator

QR Code Generator Guide

Key Features

Use Cases

常见问题

相关工具