QR Code Generator — Developer Code Samples

Generate QR codes programmatically for URLs, contact cards, WiFi credentials, and plain text. Python's qrcode library and the qrcode npm package produce QR code images. For web use, qrcode.js renders directly to canvas without a server round-trip.

Try the interactive version online: Open QR Code Generator Tool →

Parameters

Parameter	Type	Required	Description
data	str	Yes	Content to encode: URL, text, vCard, WiFi string, etc.
error_correction	str	No	Error correction level: L (7%), M (15%), Q (25%), H (30%) (default: M)
box_size	int	No	Pixels per QR module/box (default: 10)
border	int	No	Quiet zone width in boxes (default: 4)

Returns: QR code image as PIL Image object, PNG bytes, Base64 data URI, or SVG string

Code Examples

# Install: pip install qrcode[pil]

# Install: pip install qrcode[pil]
import qrcode
from qrcode.image.pure import PyPNGImage
import io
import base64

# Basic QR code
qr = qrcode.QRCode(
    version=1,
    error_correction=qrcode.constants.ERROR_CORRECT_M,
    box_size=10,
    border=4,
)
qr.add_data("https://toolpilot.dev")
qr.make(fit=True)

# Save as PNG file
img = qr.make_image(fill_color="black", back_color="white")
img.save("qr_code.png")
print("Saved qr_code.png")

# Generate as Base64 data URI (for web embedding)
buffer = io.BytesIO()
img.save(buffer, format="PNG")
b64 = base64.b64encode(buffer.getvalue()).decode('ascii')
data_uri = f"data:image/png;base64,{b64}"
print(f"Data URI length: {len(data_uri)}")

# Generate WiFi QR code
wifi_string = "WIFI:T:WPA;S:MyNetwork;P:MyPassword;;"
qr_wifi = qrcode.make(wifi_string)
qr_wifi.save("wifi_qr.png")

# Generate vCard QR code
vcard = (
    "BEGIN:VCARD
"
    "VERSION:3.0
"
    "FN:Alice Smith
"
    "ORG:Acme Corp
"
    "EMAIL:[email protected]
"
    "TEL:+1-555-1234
"
    "END:VCARD"
)
qr_vcard = qrcode.make(vcard)
qr_vcard.save("contact_qr.png")

# Custom colors
img_colored = qr.make_image(fill_color="#0066CC", back_color="#F0F8FF")
img_colored.save("colored_qr.png")

// Install: npm install qrcode

// Browser: Using qrcode.js library (add via CDN or npm)
// <script src="https://cdn.jsdelivr.net/npm/qrcode/build/qrcode.min.js"></script>

// Generate QR code to a canvas element
QRCode.toCanvas(document.getElementById('canvas'), 'https://toolpilot.dev', {
  width: 300,
  margin: 4,
  color: { dark: '#000000', light: '#FFFFFF' }
}, (err) => {
  if (err) console.error(err);
  console.log('QR code generated!');
});

// Generate QR code as data URL
QRCode.toDataURL('https://toolpilot.dev', {
  width: 300,
  errorCorrectionLevel: 'M'
}, (err, url) => {
  if (err) throw err;
  document.getElementById('qr-img').src = url;
});

// Node.js: Save QR code to file
const QRCode = require('qrcode');
const fs = require('fs');

// To PNG file
QRCode.toFile('qrcode.png', 'https://toolpilot.dev', {
  width: 300,
  margin: 4,
}, (err) => {
  if (err) throw err;
  console.log('Saved qrcode.png');
});

// To SVG string
QRCode.toString('https://toolpilot.dev', { type: 'svg' }, (err, svg) => {
  if (err) throw err;
  fs.writeFileSync('qrcode.svg', svg);
});

// WiFi QR code
const wifiData = 'WIFI:T:WPA;S:MyNetwork;P:MyPassword;;';
QRCode.toFile('wifi-qr.png', wifiData, { width: 300 });

# Install qrcode CLI
pip install qrcode[pil]

# Generate QR code PNG from URL
qr "https://toolpilot.dev" > qr.png

# Print QR code in terminal (ASCII art)
pip install qrcode
python3 -c "import qrcode; qr = qrcode.make('https://toolpilot.dev'); qr.save('/dev/stdout')" 2>/dev/null | open -f -a Preview

# Using qrencode (brew install qrencode)
qrencode -o qr.png "https://toolpilot.dev"
qrencode -t UTF8 "https://toolpilot.dev"  # Terminal display

# WiFi QR code
qrencode -o wifi-qr.png "WIFI:T:WPA;S:MyNetwork;P:SecretPass;;"

# Generate and open immediately (macOS)
qrencode -o /tmp/qr.png "https://toolpilot.dev" && open /tmp/qr.png

Other Tool APIs

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View all API docs →