Generate QR Code

Build the text for common QR payloads - web link, Wi-Fi login, contact card, e-mail, phone - then choose size, colours and error correction. Scan the preview with your phone to test it.

URL

Network name (SSID) Password Security

Name Company Phone E-mail

Any text

Encoded text

Download SVG Download PNG

How it works

A QR code just stores text. Phones recognise special formats: WIFI:T:WPA;S:name;P:pass;;, BEGIN:VCARD ..., mailto:, tel:, https://.
Error correction adds redundancy: level H still scans with 30% of the code damaged or covered by a logo, but the code gets denser.
Certificates (361) use a QR with the verification URL; invoices and receipts encode number + amount.

Map<EncodeHintType, Object> hints = Map.of(
    EncodeHintType.CHARACTER_SET, "UTF-8",
    EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H,
    EncodeHintType.MARGIN, 2);
BitMatrix m = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, 320, 320, hints);