A QR Code (Quick Response Code) is a two-dimensional matrix barcode that stores information through different arrangements of black and white squares. It can store URLs, text, phone numbers, email addresses, and more. Simply scan it with a smartphone or dedicated scanner to instantly access the stored information.

What are the error correction levels for QR Codes?

QR Codes use Reed-Solomon error correction with four levels: L (Low, 7%), M (Medium, 15%), Q (Quartile, 25%), and H (High, 30%). Higher levels allow more damage or obstruction while remaining scannable, but require more space. For everyday use, M level is recommended. For adding logos or branding, H level is best.

How do I create a custom colored QR Code?

Our QR code generator supports custom foreground and background colors. You can select any color, or use the 'Transparent Background' option for PNGs with no background. Note that some older scanners may not recognize colored QR codes. Black and white QR codes have the best compatibility.

What size should my QR Code be?

QR Code size depends on scan distance and content complexity. General guidelines: For business cards and small items, use 128-256 pixels; for posters and brochures, use 256-512 pixels; for large outdoor signage, use 512 pixels or more. Larger sizes allow greater scanning distances but result in larger file sizes.

Can I add a logo to my QR Code?

Adding a logo in the center of a QR code covers part of the data area, so a high error correction level (H level, 30%) is required. Our tool generates QR codes using H-level error correction by default, allowing you to add a logo in image editing software. We recommend keeping the logo size under 20% of the QR code.

Is using an online QR Code generator safe?

Yes! Our QR code generator runs entirely in your browser. All data processing happens locally on your device and nothing is sent to any server. This means your content is completely private and secure, making it ideal for generating QR codes with sensitive information like contact details or private URLs.

What types of content do QR Codes support?

Standard QR codes support various data types: plain text, URLs, phone numbers (SMS or call), email addresses, WiFi network configurations (SSID and password), vCard contact information, geographic locations, and more. Our tool automatically detects your input content type and generates the appropriate QR code.

How can I improve QR Code scanning success rate?

Tips for better scanning: 1) Maintain sufficient contrast, avoid colors that are too similar; 2) Keep content concise—long URLs create complex QR codes; 3) Leave adequate white space (quiet zone), at least 10% of the QR code size; 4) Choose the appropriate error correction level for your needs; 5) Avoid placing other elements over the QR code.

QR Code Generator - Free Online QR Code Creator

What is a QR Code?

A QR Code (Quick Response Code) is a two-dimensional matrix barcode invented by Denso Wave, a Japanese Toyota subsidiary, in 1994. Unlike traditional one-dimensional barcodes, QR codes can store more types of information in a smaller space.

QR codes can store:

Website URLs: Direct link to web pages
Text: Plain text content
Contact Information: Phone numbers, emails, addresses
WiFi Configuration: Network name and password
Payment Information: Payment service QR codes

How to Scan a QR Code?

📱 Mobile Scanning

Most smartphones have built-in camera support for QR code scanning. iOS Camera and Android cameras automatically recognize QR codes when pointed at them. Apps like WeChat, Alipay, and many others also have built-in scanner features.

💻 Computer Scanning

You can use desktop WeChat, browser extensions, or dedicated scanner tools. Some websites also support camera-based scanning. You can also upload a QR code image to our tool for decoding.

Understanding QR Code Error Correction Levels

QR codes use Reed-Solomon error correction algorithms, allowing them to be scanned correctly even when partially obscured or damaged. Higher error correction levels can recover more data.

Level	Error Recovery	Best For
L (Low)	~7%	Clean environments, no obstruction needed
M (Medium)	~15%	Recommended for everyday use
Q (Quartile)	~25%	Industrial environments with light damage
H (High)	~30%	Adding logos or harsh environments

How to Optimize Your QR Code Design?

✅ Best Practices

• Keep adequate white space (quiet zone of at least 10% of QR code size)
• Use high contrast color combinations (black/white is best)
• Keep content concise; shorter URLs are better
• Choose appropriate size based on use case
• Use URL shorteners to reduce character count

❌ Things to Avoid

• Using foreground and background colors that are too similar
• Making QR codes too small for easy scanning
• Adding too many decorative elements over the QR code
• Placing QR codes on busy patterned backgrounds

Why Choose Our QR Code Generator?

✓ Completely Free: No registration, no payment, no usage limits
✓ Privacy Protected: All processing happens locally in your browser, nothing is uploaded
✓ Feature Rich: Customizable size, colors, and error correction levels
✓ High Quality Output: Generates high-quality PNG images with large size support
✓ Multi-language Support: Create QR codes with content in Chinese, English, Japanese, and more

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Complete Guide to QR Codes: How to Create and Optimize Your QR Code