What Is a QR Code? A Complete Guide
Learn what QR codes are, how they work, what types exist, and how to use them effectively for marketing, business, and personal use.
What Is a QR Code?
A QR code (Quick Response code) is a two-dimensional barcode that smartphones can scan with their camera. Unlike a standard barcode that stores a number, a QR code can store a URL, Wi-Fi password, contact details, calendar events, and more — instantly readable without typing anything.
How Do QR Codes Work?
A QR code is made up of black and white square modules arranged in a grid. The pattern encodes data using a combination of position markers, timing patterns, and data modules. When a camera scans the code, software decodes the pattern and extracts the stored information in milliseconds.
What Can a QR Code Store?
- URL — the most common use. Links to a website, landing page, or product listing.
- Wi-Fi credentials — lets guests connect without sharing a password verbally.
- Contact card (vCard) — share your name, phone, email, and address in one scan.
- Social profiles — link to Instagram, LinkedIn, TikTok, and others.
- Email (Mailto) — open a pre-addressed email draft.
- SMS — open a text message to a pre-filled number.
- Phone number — dial your number directly.
- Calendar event — add an event to the scanner's calendar automatically.
- Payment link — link to a Venmo, PayPal, Stripe, or Apple Pay URL.
Static vs. Dynamic QR Codes
A static QR code has its destination baked in permanently. Change the URL, and the code breaks — you'd need to reprint. A dynamic QR code uses a short redirect URL, so you can update the destination anytime without reprinting. Dynamic codes also track every scan with device, country, and browser data. Read the full comparison →
How to Scan a QR Code
On iPhone and Android, open the Camera app and point it at the code. A notification or link appears at the top of the screen — tap it. No dedicated app is needed on modern phones.
Are QR Codes Free to Use?
Yes. Creating and scanning QR codes costs nothing. Our QR Code Generator is completely free. Pro features like dynamic codes and scan analytics are available on a paid plan.