How to make a WhatsApp direct message QR code for Pakistan (+92)?

Switch to the "WhatsApp" tab, input your phone number (e.g., 923001234567 or 03001234567), and write an optional pre-filled message. When scanned, it automatically launches WhatsApp on the user’s smartphone and opens a direct chat window.

Can I upload a custom company logo in the center of the QR code?

Yes! ConvertHub allows uploading PNG, SVG, or JPG brand logos. When a logo is uploaded, our engine automatically applies High (30%) Error Correction (ECC Level H) and draws a rounded badge behind the logo, ensuring the QR code scans reliably across all devices.

What is the best format to download QR codes for billboard or brochure printing?

For professional printing on banners, brochures, business cards, or packaging, download the Vector SVG format — it provides infinite resolution with zero pixelation at any physical size. For digital use, our ultra-sharp 2048px PNG export is ideal.

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Developer Tools•Free & Instant

Smart QR Code & Barcode Generator

Generate high-res QR codes for URLs, Wi-Fi auto-connect, vCards, and WhatsApp chats in SVG, PNG, and WebP.

Instant browser processing Private & Auto-Purged

🔒 100% Client-Side QR Generation • Zero Data Transmission

Your data is computed entirely inside your browser's JavaScript engine and is never sent to our servers.

Configure URL / Link Data

Target Website URL

Scanned by iPhone and Android camera apps to open the web link directly.

Visual Customizer & Styling

Curated Color Themes

QR Pattern Color

Background Color

Error Correction Level

Center Brand Logo (Optional)

Live Preview

Ready to Scan

Vectorized rendering • Encoded size: 22 chars

Raw Payload String:

https://converthub.app

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How to Convert with Smart QR Code & Barcode Generator

Follow these 3 simple steps to complete your conversion in seconds.

Step 1 of 3

Paste or Upload Source Data

Paste your Smart QR Code & Barcode code directly into the left editor pane or click Upload to select a file.

💡 Tip: 100% client-side execution in your browser memory. Zero server uploads.

Step 2 of 3

Configure Syntax & Dialect Options

Adjust indentation (2 or 4 spaces), toggle alphabetical key sorting, set SQL table name and dialect quotes, or pick a built-in template.

Step 3 of 3

Instant Result & Copy / Download

View formatted output in real time with line numbers and syntax highlighting. Click Copy or Download to save.

QR Code Reed-Solomon Error Correction & Encoding Standard

Formula representation used for accurate calculations:

Reed-Solomon Error Correction Capacity: Low (7%), Medium (15%), Quartile (25%), High (30%) Payload String Formatting: Standard ISO/IEC 18004 2D Matrix Symbol

Calculation Example: Wi-Fi Network: WIFI:S:Office_WiFi;T:WPA;P:SecretKey;; | WhatsApp: https://wa.me/923001234567?text=Hello

QR Code Error Correction Levels & Data Density Reference Table

Quick reference lookup table for standard unit calculations.

Standard Reed-Solomon Error Correction Code (ECC) recovery thresholds for QR matrix symbols.
ECC Level	Restoration Capacity	Recommended Use Case
Level L (Low)	~7% of data codewords	Clean digital screens & short URLs
Level M (Medium)	~15% of data codewords	General purpose marketing, business cards
Level Q (Quartile)	~25% of data codewords	Outdoor signage, industrial environments
Level H (High)	~30% of data codewords	Branded QR codes with centered company logos

Frequently Asked Questions

Common questions and answers about Smart QR Code & Barcode Generator.

Select the "Wi-Fi Network" tab, enter your network SSID (name), choose your security type (WPA/WPA2/WPA3 or Open), and input the password. ConvertHub formats the standard WIFI:S:ssid;T:WPA;P:password;; payload so guests can scan with their phone camera and connect immediately without typing passwords.