QR Code Generator
Generate QR codes online for free. Customizable size with instant preview and PNG download. No data sent to servers.
How to Use
QR codes are the fastest way to share links, text, and contact information between devices. This free online QR code generator creates high-quality QR codes instantly in your browser with no data sent to any server. Here is how to use it:
- Enter your content in the input field. Type or paste a URL, text message, email address, phone number, or any other data you want to encode. URLs are the most common QR code content, but any text string works.
- Preview the QR code as it generates in real time. The QR code updates instantly as you type, so you can see the result immediately without clicking a generate button.
- Adjust the size if needed. Choose from standard sizes or set a custom dimension. Larger sizes are better for printing, while smaller sizes work for digital displays.
- Download the PNG by clicking the download button. The QR code is saved as a high-quality PNG image with a transparent or white background, ready for use in documents, websites, business cards, or physical signage.
For URLs, always include the full address with the protocol (https://). Most QR code readers will not automatically add the protocol, so "example.com" may not open correctly, but "https://example.com" will work on every device. You can verify your URLs are properly formatted using a URL encoding tool.
QR Code Content Examples
- Website URL:
https://devtoolkit.io - Email link:
mailto:hello@example.com - Phone number:
tel:+1234567890 - SMS message:
sms:+1234567890?body=Hello - Wi-Fi credentials:
WIFI:T:WPA;S:NetworkName;P:Password;; - Plain text: Any text up to approximately 4,000 characters
About This Tool
QR codes (Quick Response codes) are two-dimensional barcodes invented by Denso Wave, a Toyota subsidiary, in 1994. Originally designed for tracking automotive parts on assembly lines, QR codes have become the universal standard for encoding machine-readable data in a compact visual format. As of 2026, QR codes are used by over 2.2 billion smartphone users worldwide for payments, authentication, marketing, ticketing, and information sharing.
A QR code encodes data as a pattern of black and white squares called "modules" arranged in a square grid. The code includes several structural elements: three finder patterns (the large squares in three corners) for orientation detection, alignment patterns for distortion correction, timing patterns for module coordinate calibration, and format/version information for decoder configuration. The remaining area contains the encoded data plus Reed-Solomon error correction codes that allow the QR code to be read even when up to 30% of the modules are damaged or obscured.
QR codes support four data encoding modes: numeric (0-9, most efficient at 3.3 bits per character), alphanumeric (0-9, A-Z, and nine symbols, at 5.5 bits per character), byte (any 8-bit data, at 8 bits per byte), and Kanji (Japanese characters at 13 bits per character). The maximum capacity depends on the encoding mode and version (size): a Version 40 QR code (177x177 modules) can hold 7,089 numeric characters, 4,296 alphanumeric characters, or 2,953 bytes of arbitrary data. In practice, most QR codes encode URLs of 50-200 characters, which fits comfortably in smaller versions.
Error Correction Levels
QR codes use Reed-Solomon error correction at four levels: L (7% recovery), M (15% recovery), Q (25% recovery), and H (30% recovery). Higher error correction means the code can tolerate more damage — essential for printed QR codes that might get scuffed, folded, or partially covered. However, higher correction levels reduce the data capacity because more modules are used for redundancy. For clean digital displays, Level L or M is sufficient. For printed materials exposed to wear, Level Q or H is recommended.
Why Use This Tool
QR codes have become an indispensable tool for bridging the physical and digital worlds. Here are the most common reasons people create QR codes:
- Marketing and advertising — Businesses place QR codes on print materials (flyers, posters, business cards, product packaging) to direct customers to websites, landing pages, social media profiles, and promotional offers. QR codes eliminate the need to type long URLs manually, increasing conversion rates from physical materials to digital actions.
- Restaurant menus and ordering — Since 2020, QR code menus have become standard in restaurants worldwide. A single QR code on each table links to a digital menu that can be updated instantly without reprinting. Many restaurants now use QR codes for ordering and payment as well, reducing staff workload and contact.
- Event ticketing and check-in — Concert venues, conferences, airlines, and transit systems use QR codes as digital tickets. Attendees show a QR code on their phone, which is scanned for instant validation. This eliminates paper ticket printing, prevents counterfeiting, and speeds up entry lines.
- Wi-Fi sharing — Instead of dictating a complex Wi-Fi password, you can encode your network credentials in a QR code. Guests scan the code and connect automatically — no typing required. This is especially useful for businesses, co-working spaces, and Airbnb hosts. For generating complex passphrases, use the Password Generator.
- Contact information sharing — QR codes can encode vCard data (name, phone, email, address, company), allowing people to share contact information by scanning a code instead of exchanging physical business cards. The scanned contact is automatically added to the phone's address book.
- Payments — QR code payments are the dominant payment method in many Asian markets, with platforms like Alipay, WeChat Pay, and PayNow processing billions of transactions annually. Even in Western markets, QR-based payments are growing through Apple Pay, Google Pay, and banking apps.
Privacy and Security
This QR code generator runs entirely in your browser. The text, URL, or data you encode is never transmitted to any server. This matters because QR codes often contain sensitive information: Wi-Fi passwords, private URLs with authentication tokens, contact details, and payment links. Many online QR generators send your data to their servers for processing, which creates a record of what you encoded. DevToolKit's client-side approach ensures complete privacy — the only copy of your QR code exists in your browser until you download it.