QR Code Generator

What is QR Code Generator?

Free QR code generator. Create QR codes for URLs, plain text, WhatsApp number, email, SMS, and WiFi. Download as PNG instantly. Instant generators for passwords, QR codes, barcodes, and more. TekPulse's QR Code Generator is completely free — no signup, no ads in results, and no data stored on our servers.

How to Use QR Code Generator Online

1. Choose the QR code type: URL, Text, WhatsApp, Email, Phone, Wi-Fi, UPI, or vCard
2. Enter the required information for your chosen type
3. Customise QR code size, foreground colour, and background colour
4. Click "Generate QR Code" and preview the result
5. Download as PNG or scan it with your phone camera to test before use

QR Code Generator Formula & Calculation

A QR code encodes data into a grid of black/white modules using Reed-Solomon error correction, which adds redundant data so the code can still be read even if part of it is damaged, dirty, or covered by a logo. This tool generates codes at Error Correction Level M (Medium — roughly 15% of the code can be destroyed/obscured and it will still scan correctly), a sensible default balancing data capacity against damage resistance. The library automatically picks the smallest QR 'version' (grid size, from 21×21 up to 177×177 modules) that fits your content at that correction level — more data means a bigger, denser grid.

The content itself is formatted per QR convention for each type: a WiFi QR encodes 'WIFI:T:<encryption>;S:<ssid>;P:<password>;;', a WhatsApp link becomes a wa.me URL with the phone number and pre-filled message URL-encoded, and an SMS/Email QR uses the sms: / mailto: URI schemes that phones recognize and route to the right app automatically on scan.

Key Factors That Affect Your Result

1. Error correction level — Higher levels (Q, H) make the code more resistant to smudges, print defects, or a logo placed in the center, at the cost of a denser, harder-to-scan-at-a-distance pattern. Level M (used here) is the common middle ground for most printed and digital use cases.
2. Content length vs. code density — Longer URLs or text force a bigger QR grid (higher "version"), which needs a sharper camera and more physical print size to scan reliably — shortening a URL before encoding it keeps the code simpler and more scannable.
3. Content type formatting — Using the correct URI scheme (wa.me, mailto:, sms:, WIFI:) is what makes a phone's camera app recognize the QR as "open WhatsApp" or "connect to WiFi" instead of just showing raw text — plain text QR codes don't trigger these app actions.
4. Foreground/background contrast — Scanners rely on high contrast between the dark and light modules; low-contrast color choices (e.g., light gray on white) can make an otherwise valid QR code unreadable by cameras.

Why Use TekPulse QR Code Generator?