What Is a QR Code?
QR (Quick Response) codes are two-dimensional barcodes that store data in a grid of black and white squares. Invented in 1994 by Denso Wave, a subsidiary of Toyota, they were originally designed for tracking automotive parts during manufacturing. Today, QR codes are used globally for everything from restaurant menus and WiFi sharing to contactless payments and digital business cards.
A single QR code can store up to 4,296 alphanumeric characters or 7,089 numeric characters. They include built-in error correction technology, which means they can still be scanned correctly even when partially damaged, dirty, or obscured — a feature that makes logo embedding possible.
QR codes use four error correction levels: L (7%), M (15%), Q (25%), and H (30%). Level H can recover up to 30% of the code's data, which is why it's used when a logo covers part of the QR code. Higher error correction produces a slightly denser code but dramatically improves reliability.
Modern smartphones scan QR codes natively using the camera app — no separate scanning app is needed. iPhones have supported this since iOS 11 (2017) and Android devices since Android 9 (2018). Simply point your camera at a QR code and a notification appears with the encoded action.
The QR codes generated by this tool are static codes — the data is encoded directly in the image. They never expire, don't depend on any external service, and work forever as long as the destination URL remains active. Unlike dynamic QR codes (which require a subscription service), static codes are completely free and self-contained.
How to Create a QR Code for Free
Creating a QR code with this tool takes seconds. First, select the type of QR code you need: URL, WiFi, vCard contact, email, phone, SMS, or plain text. Each type optimizes the encoding format for that specific use case.
Enter your content in the input fields. The QR code preview updates in real-time as you type. For URLs, the tool automatically validates the format and prepends “https://” if needed. For WiFi codes, enter your network name and password, and the tool handles the proper WiFi QR encoding format.
Customize your QR code with colors that match your brand, add your company logo (free — competitors charge $7-12/month for this), and choose your preferred download size. For print materials, use 1024px or larger; for web and social media, 512px is usually sufficient.
Download your QR code as PNG, SVG, or JPEG. SVG is the best choice for print because it's a vector format that scales to any size without losing quality. Always test your QR code by scanning it with a smartphone before printing — different cameras handle contrast and sizing differently.