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QR codes have become a silent part of daily life — restaurant menus, event tickets, payment links and even vaccine records. Despite being everywhere, most people have no idea what is actually happening when a camera reads one. Let's fix that.

What Is a QR Code?

QR stands for Quick Response. A QR code is a two-dimensional barcode that stores data in a grid of black and white squares. Unlike a traditional one-dimensional barcode, a QR code can hold hundreds of times more information and can be read from any angle.

What Can a QR Code Store?

A simple URL, which is the most common use.
Plain text, such as a Wi-Fi password or a note.
Contact information in vCard format.
Email addresses and pre-filled messages.
Payment or app-download links.

How Reading Works

The three square "finder" patterns in the corners let the scanner detect the code and its orientation instantly. The camera captures the module grid, decodes the pattern into binary data, and maps those bits back to text, a URL, or whatever the code carries.

Why Scanners Read QR Codes Fast

Error correction lets damaged or partially covered codes still decode.
Any orientation works — no need to align the phone perfectly.
Modern phones decode them natively in the camera app.

How to Create Your Own QR Code

Creating a QR code takes seconds with a free generator:

Open the QR code generator at Duronto Tech.
Paste your URL or text into the input box.
Choose a size that fits your use (300 px is a solid default).
Generate and download it as a PNG.

Best Practices for Printing QR Codes

Use a large enough size — never scale a tiny QR code up from 100 px.
Keep quiet white space on all sides so scanners can find the finder patterns.
Test with the camera app your users will actually use.

Conclusion

QR codes pack surprisingly rich data into a simple pattern and read in a fraction of a second. Now that you know how they work, you can create professional, scannable QR codes for your own projects anytime.