What Is a QR Code? Everything You Need to Know
QR codes are everywhere — on menus, business cards, packaging, and billboards. Here is what they actually are and how they work.
What does QR stand for?
QR stands for Quick Response. Invented in 1994 by Denso Wave (a Toyota subsidiary) to track automotive parts, QR codes are two-dimensional barcodes that store data in a grid of black and white squares. Unlike traditional barcodes that hold around 20 characters, QR codes can store up to 4,296 alphanumeric characters.
How do QR codes work?
When you scan a QR code with your smartphone camera, the device reads the pattern of modules (the black and white squares) and decodes the embedded data. The three large squares in the corners help the scanner determine the code orientation. The data can be a URL, plain text, contact information, Wi-Fi credentials, or other structured content.
Tips
- Modern smartphones can scan QR codes directly from the camera app — no special app needed
- QR codes include built-in error correction, so they can still work even if partially damaged
Static vs dynamic QR codes
Static QR codes encode data directly into the image. They never expire and work without any server. Dynamic QR codes use a short redirect URL, which means you can change the destination after printing. Dynamic codes also enable scan tracking and analytics.
Tips
- Use static codes for permanent content like Wi-Fi passwords or contact cards
- Use dynamic codes when you need to update the destination or track scans
Common QR code use cases
Businesses use QR codes for restaurant menus, product packaging, business cards, event tickets, Wi-Fi sharing, payment links, app downloads, social media profiles, and marketing materials. The COVID-19 pandemic accelerated adoption, making QR codes a standard part of everyday life.
How to create a QR code
You can create a QR code in seconds using a free generator. Choose your content type (URL, Wi-Fi, vCard, etc.), enter the data, optionally customize the design with colors and a logo, and download as PNG, SVG, or PDF. No signup required for static codes.
Frequently Asked Questions
Are QR codes free to create?
Yes. Static QR codes are free to create and use. Dynamic QR codes with tracking may require a paid plan depending on the platform.
Do QR codes expire?
Static QR codes never expire. Dynamic QR codes stay active as long as the redirect service is running.
Can QR codes be scanned from a screen?
Yes. QR codes can be scanned from phone screens, computer monitors, printed materials, and any other surface.
Are QR codes safe to scan?
QR codes themselves are safe, but they can link to malicious websites. Always check the URL preview before opening unknown QR codes.
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