Complete Guide to QR Code Generation and Use
QR codes are widely used for payments, information sharing, WiFi access, e-tickets, and more. This guide covers common QR code types, use cases, and how to generate them for free with SheetEdit Tools.
What is a QR code?
A QR code (Quick Response code) is a two-dimensional matrix barcode: data is stored in a square pattern of black and white modules. It can hold much more information than a typical 1D barcode (URLs, text, WiFi credentials, vCard data, etc.) and includes error correction so partial damage may still allow scanning. “QR” is one format; SheetEdit also supports other 2D symbologies such as Data Matrix and PDF417.
QR code types
Standard QR Code
The most common format, storing URLs, text, contact info, etc. Good capacity, fast scanning, and broad compatibility. Suitable for most everyday uses.
Data Matrix
High-density 2D code for storing more data in less space. Used in logistics, electronics, and medical devices. Resistant to damage; can often be read even when partially damaged.
PDF417
Stacked barcode for large amounts of data (hundreds of characters). Common in driver’s licenses, boarding passes, and shipping documents.
Aztec Code
Center-located matrix code with no quiet zone required. Fits in tight spaces. Often used for transport tickets and event passes.
Common use cases
URLs and links
Convert web links to QR codes for easy mobile access. Useful for flyers, posters, and product packaging. Test scanning after generation to ensure the link works.
WiFi access
Encode WiFi SSID, password, and encryption into a QR code so guests can connect by scanning. Ideal for home, office, shops, and events.
Contact info (vCard)
Encode name, phone, email, and address as a vCard QR code for easy contact exchange. Scanners can save directly to contacts. Good for meetings, trade shows, and networking.
Payments
Some payment platforms support payment QR codes. This tool can store payment links or account info; follow each platform’s rules.
E-tickets and check-in
Encode ticket or check-in data for events, conferences, and logistics tracking.
Generating QR codes with SheetEdit Tools
Basic steps
- Open the Codes page and select the QR type (QR Code, Data Matrix, PDF417, Aztec).
- Enter the content to encode (URL, text, JSON, etc.).
- Adjust size and error correction if available.
- Export as PNG or PDF, or print directly.
Content formats
- URL: Enter the full URL, e.g.
https://example.com. - WiFi: Use the WiFi QR tool with SSID, password, and encryption.
- vCard: Use the vCard QR tool with name, phone, email, etc.
- Contact QR: Use Contact QR for phone, SMS, email, or location shortcuts.
Print and display tips
- Size: Minimum about 2×2 cm for reliable scanning.
- Contrast: Ensure clear contrast between code and background; avoid glare or blur.
- Quiet zone: Leave blank space around the code to avoid cropping or obstruction.
FAQ
Q: The QR code won’t scan. What’s wrong?
A: Check content, size (not too small), and avoid glare or damage. Try higher error correction or larger size.
Q: How much data can a QR code hold?
A: Standard QR Code holds about 4,000 characters (more for numeric). More content means denser patterns and stricter print/scan requirements.
Q: Is data sent to a server?
A: No. SheetEdit Tools generates QR codes entirely in the browser; no data is uploaded.
For more tools, visit the Codes page.
Browse more guides and tutorials at the Article Index.