QR Code Generator

A QR code that never leaves the browser

QR codes are just a compact way to put a URL, a sentence, or a Wi-Fi login on a poster, slide, or packaging. Most generators send the payload to a server to draw the image. This one encodes locally, so a guest-network password or a draft link never leaves the device.

Pick Text for any string, URL to add https:// when you omit a scheme, or Wi-Fi to emit the WIFI:T:WPA;S:…;P:…;; payload that iPhone and Android cameras open as a join prompt. mailto:, tel:, and sms: work if you type the full scheme in the URL box.

Error correction (L/M/Q/H) is spare modules that let a scuffed print still scan. M is enough on a bright screen. Use H if you will print small, laminate, or drop a logo in the centre — the grid gets denser, so print larger.

Download PNG at 128–1024 px for chat and slides. Download SVG when the code will be printed or scaled in a layout tool. Keep dark modules on a light background and leave a quiet zone; low contrast is the usual reason a phone camera shrugs.

Need a short link on the same poster? Pair this with the URL Shortener, then encode the short URL here so the printed code stays simple. Encoding and download stay on-device.

What you can encode

• URL — opens in the phone’s browser. https:// is added if you leave out the scheme.
• Plain text — shown as text; useful for serial numbers, short notes or codes to copy.
• Wi-Fi — joins a network without typing the password. Special characters in the network name or password (; , : \ ") are escaped automatically, which is the most common reason hand-made Wi-Fi codes fail.

Download as PNG at the pixel size you choose, or as SVG for print, where it scales to any size without blurring.

Error correction and density

QR codes can recover from damage using four error-correction levels: L restores about 7% of the code, M 15%, Q 25% and H 30%. Higher levels add more modules (squares), making the code denser. Use M for screens and clean prints, Q or H for codes on packaging, outdoor signs or anything that may get scratched — or if you place a small logo over the centre.

Content length matters more than the level. A long URL with tracking parameters makes a dense code that is harder to scan from a distance; shorten the link or drop unnecessary parameters first.

Printing a code that scans

• Size: a common rule is that scanning distance should be no more than about 10 times the code’s width — a 2 cm code for a leaflet held in the hand, 10 cm or more for a poster read from a metre away.
• Quiet zone: keep a clear margin around the code. The QR standard specifies 4 modules; most phones cope with 2, but give printed codes the full margin.
• Contrast: dark modules on a light background. Inverted (light-on-dark) codes and low-contrast brand colours fail on many scanners.
• Test before printing: scan the final artwork with two different phones, at the real size and distance.

Static codes do not expire

The codes made here are static: the content is stored in the pattern itself, so they never expire, need no account, and do not track scans. The trade-off is that they cannot be edited — if the destination might change, encode a URL on your own domain that you can redirect later.