What This Tool Does
This QR code generator creates scannable QR codes from any text, URL, Wi-Fi network credentials, or contact card. The QR code is rendered in your browser as an image and can be downloaded as a PNG for printing on flyers, business cards, posters, or product packaging.
Inputs Explained
- QR Type: Choose URL, plain text, Wi-Fi network, or vCard contact.
- Content: The data to encode — URL, message, or network credentials, depending on the type.
- Size: Pixel dimensions of the output. 256–512 px is ideal for screens; 600+ for printing.
How It Works
The tool uses the QRCode.js library loaded from a public CDN to encode your input as a QR matrix and render it on an HTML canvas. Wi-Fi and vCard inputs are first formatted into the standard payload strings that QR-aware apps recognize.
Formula / Logic Used
QR Code Generator
Generate a QR code for any URL, text, Wi-Fi, or vCard. Download as PNG in one click.
Step-by-Step Example
Type: URL
Content: https://bulkcalculator.com
Size: 320 × 320
Result: A scannable square QR code that opens the URL in any phone camera. Click Download PNG to save it.
Use Cases
- Restaurant menus: Print a QR on each table that opens your digital menu instantly.
- Wi-Fi sharing: Let guests connect to your network by scanning a QR — no password typing.
- Business cards: Embed a vCard QR so people save your contact details with one scan.
- Marketing flyers: Add a QR that opens your landing page, app store listing, or promo offer.
- Event check-in: Generate URL QRs that link to ticket pages or registration forms.
Assumptions and Limitations
- Maximum capacity per QR is around 4,296 alphanumeric characters. Long content reduces scannability.
- Wi-Fi QR codes work natively on iOS 11+ and Android 10+. Older phones may need a third-party app.
- PNG download uses the rendered image. Print at 300 DPI for crisp results — use the 800 px size for posters.
- The tool requires loading the QRCode.js library from a public CDN (cdnjs). Your QR content itself is never sent.
Frequently Asked Questions
Is the QR code generation free?
Yes, completely free. No watermarks, no sign-up, no usage limits. The QR images are yours to use commercially.
Will the QR code expire?
No. The QR is just a static encoding of your content. As long as the URL or data inside it remains valid, the QR will work forever.
Can I customize the QR color?
This basic version generates standard black-on-white QRs for maximum scanner compatibility. Colored QRs work but reduce reliability on older scanners.
How do I scan a QR code?
Open your phone's camera app and point it at the QR. iOS and Android both detect QRs automatically and show a notification with the action.
What is a vCard QR?
A vCard is the standard format for digital business cards. When scanned, your phone offers to save the contact directly to your address book.
Why does my Wi-Fi QR not connect?
Check that the SSID, password, and encryption type match exactly. Hidden networks may also need the H:true flag, which is rare. Older phones may not support Wi-Fi QR connection at all.
Can I download as SVG instead of PNG?
This version supports PNG only. PNG is universally supported by print services and digital channels.
Is there a size limit?
You can encode up to 4,296 alphanumeric or 7,089 numeric characters. For best scanability, keep URLs under 200 characters and use a URL shortener for long links.
Sources and References
- ISO/IEC 18004 — QR Code Standard — Official QR code specification.
- QRCode.js Library — Open-source library used to render QR codes.
- vCard 3.0 Specification (RFC 2426) — Standard for digital business cards.
- Wikipedia — QR Code — Background on QR code formats and capacities.