.qrcode{ border-style:none; border-collapse:collapse; margin:0; padding:0; } .dark, .light{ margin:0; padding:0; width: 1.25mm; height: 1.25mm; } .dark{ background-color: #000; } .light{ background-color: #fff; } '; // google authenticator $qr = new QRCode('otpauth://totp/test?secret=B3JX4VCVJDVNXNZ5&issuer=chillerlan.net', QRConst::ERROR_CORRECT_LEVEL_M); echo $qr->printHTML();