QR Code Generator — Text and URL to QR

Text or URL

Error correction level L (~7%) M (~15%) Q (~25%) H (~30%)

What is a QR Code?

A QR Code (Quick Response Code) is a two-dimensional barcode capable of storing text, URLs, contact details and much more. It is read by phone cameras and dedicated readers. The information is encoded in the black and white squares (modules); the three large squares in the corners are the finder patterns, which help the reader locate and orient the code.

Error correction

Every QR Code includes Reed-Solomon error correction: part of the data is redundant, so the code remains readable even if it's partially damaged, dirty or covered. There are four levels:

L — recovers ~7% of the data. Produces the smallest code.
M — ~15%. Good balance (default).
Q — ~25%. More robust.
H — ~30%. Maximum damage tolerance; useful when you're going to place a logo over the code.

The higher the correction level, the more redundancy data — and therefore a slightly larger code for the same content.

How this generator works

The code is generated entirely in your browser, with a custom implementation of the QR algorithm (byte-mode encoding with UTF-8, Reed-Solomon error correction, pattern assembly and automatic selection of the best mask). There are no external libraries or CDN. The QR version (1 to 40) is chosen automatically based on the size of the content.

Frequently Asked Questions (FAQ)

What is the maximum text size?

It depends on the correction level. At level L, a version 40 QR Code holds up to about 2,953 bytes (less for accented characters and emoji, which take up more than one byte in UTF-8). If the text doesn't fit, the tool warns you and suggests shortening it or using a lower correction level.

Can I download the QR Code?

Yes. The "Download PNG" button exports the image generated in the <canvas> as a PNG file, with a clear margin (quiet zone) around it, essential for readability.

Can I generate a QR Code to connect to a Wi-Fi network or a contact?

Yes, indirectly: just paste the text in the format readers understand — for example, WIFI:T:WPA;S:NetworkName;P:password;; for Wi-Fi. The tool generates the QR Code for any text; the meaning is interpreted by the app that scans it.