QR Code Generator

A QR (Quick Response) code is a two-dimensional barcode invented by Denso Wave in 1994 for tracking automotive parts. Unlike traditional one-dimensional barcodes that store data in a single row of bars, QR codes store data in a grid of black and white squares called modules. This two-dimensional layout allows QR codes to hold much more information — up to 4,296 alphanumeric characters or 7,089 numeric digits.

The three large squares in the corners are finder patterns that help the scanner detect and orient the code regardless of angle. Smaller alignment patterns, timing patterns, and format information areas handle error correction and version data. The remaining modules encode the actual payload using Reed-Solomon error correction, which means a QR code can still be read even if part of it is damaged or obscured.

URL:the most common use case. The QR code simply contains a web address, and scanning it opens the link in the phone's browser. Use full URLs including the https:// prefix for compatibility.

Plain text: any text string up to about 4,000 characters. Useful for serial numbers, instructions, or short messages.

Wi-Fi network: encoding a string in the format WIFI:T:WPA;S:NetworkName;P:Password;; lets someone scan the code and connect to your Wi-Fi network without typing the password. Ideal for guest networks in offices, cafes, and rental properties.

vCard (contact info):a QR code can contain a full contact card with name, phone number, email, and address. Scanning adds the contact directly to the phone's address book. This is widely used on business cards and conference badges.

The general rule is that the scanning distance is roughly 10 times the width of the QR code. A 1-inch (2.5 cm) code can be scanned from about 10 inches (25 cm) away — fine for a business card held in someone's hand. A 4-inch code works from about 40 inches, suitable for a flyer or product label. For a poster or banner meant to be scanned from several feet away, the code should be at least 8-12 inches wide.

The amount of data encoded also affects size. More data requires more modules, which makes each individual module smaller and harder to scan at a distance. If your QR code contains a long URL, consider using a URL shortener to reduce the data payload and keep the code simple. Fewer modules means larger modules and more reliable scanning at distance.

QR codes use Reed-Solomon error correction to remain readable even when partially damaged. There are four levels: L (Low, ~7%), M (Medium, ~15%), Q (Quartile, ~25%), and H (High, ~30%). The percentage indicates how much of the code can be damaged or obscured while still scanning successfully.

Higher error correction means the code can survive more damage, but it also increases the number of modules, making the code denser. Level M is the most common default and works well for most applications. Use level H if you plan to place a logo over the center of the QR code or if the code will be printed on a surface prone to wear, like outdoor signage or product packaging that gets handled frequently.

For clean digital displays where damage is unlikely, level L produces the simplest, most easily scannable code. Always test your QR code with multiple phones before printing at scale.

A static QR code encodes the data directly. Once printed, its content cannot change. This tool generates static codes, which are ideal for permanent content like a website homepage URL, a Wi-Fi password, or a product serial number. Static codes work forever and do not depend on any third-party service.

A dynamic QR code encodes a short redirect URL instead of the final destination. The redirect can be changed later without reprinting the code. Dynamic codes require a paid service to manage the redirects and typically include scan analytics (location, time, device type). They are useful for marketing campaigns where you want to update the landing page or track engagement.

Common business use cases include restaurant menus (updated seasonally without reprinting), product packaging (linking to manuals, warranty registration, or reviews), event tickets (encoding attendee information for fast check-in), real estate signs (linking to virtual tours), and retail displays (linking to online purchasing or detailed specifications).