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QR Code Generator

Generate QR codes from text or URLs

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What is a QR Code Generator?

A QR (Quick Response) code is a two-dimensional barcode that encodes text, URLs, or other data into a scannable pattern of black and white squares. Invented in 1994 by Denso Wave for tracking automotive parts, QR codes are now ubiquitous-used for payments, menus, tickets, Wi-Fi sharing, and contact exchange. They include built-in error correction, meaning they remain scannable even when partially damaged or obscured.

How to Use

  1. Enter the text or URL you want to encode into the QR code.
  2. The QR code generates automatically-adjust size if needed.
  3. Download the QR code image for use in print materials, presentations, or websites.

Frequently Asked Questions

How much data can a QR code hold?

A single QR code can store up to 7,089 numeric characters, 4,296 alphanumeric characters, or 2,953 bytes of binary data. However, more data means a denser pattern that's harder to scan-for URLs, keeping them under 100 characters produces reliably scannable codes. The QR code version (1–40) determines its size: version 1 is 21×21 modules, while version 40 is 177×177 modules. For printed materials, use URL shorteners to keep the code simple and scannable from a distance.

What is error correction in QR codes?

QR codes use Reed-Solomon error correction at four levels: L (7% recovery), M (15%), Q (25%), and H (30%). Higher levels make the code scannable even when partially covered-this is how branded QR codes can include logos in the center without breaking. The trade-off is that higher error correction increases the code density, requiring a larger print size. For standard use, level M (15%) offers a good balance between robustness and scannability.

Do QR codes expire?

Static QR codes never expire-they simply encode data directly. However, if the QR code points to a URL, the link itself could break if the website goes down. Dynamic QR codes (from paid services) use redirect URLs that can be updated later. For permanent signage or printed materials, consider using a URL you control (like your own domain with a redirect) so you can change the destination without reprinting the QR code.