Input Content
Text
URL
WiFi
Email
Phone
SMS
QR Code Preview
Click "Generate QR Code" to preview
Click "Generate QR Code" to preview
This QR Code generator is simple yet powerful, supporting multiple QR code types with rich customization options. Here is a detailed guide:
Select a Type: At the top of the input panel, click the "Text", "URL", "WiFi", "Email", "Phone", or "SMS" tab to switch QR code types. Different types will display corresponding input fields automatically. For example, selecting WiFi will ask for the network name (SSID), password, and encryption type.
Enter Content: Fill in the information you want to encode in the corresponding fields. For URL type, enter the full web address (e.g., https://example.com); for WiFi type, enter the network name and password, and select the correct encryption protocol (WPA/WEP/No Password).
Adjust Settings: In the "QR Code Settings" panel, you can adjust the size (100px to 800px), margin (0 to 10 pixels), error correction level (L/M/Q/H), as well as foreground and background colors. Larger sizes increase scanning distance; higher error correction levels make the code more resilient to damage.
Generate and Download: Click the "Generate QR Code" button, and the preview area on the right will display the generated QR code in real time. After confirming it looks correct, click the "Download PNG" button to save it locally. All operations are done in your browser locally; no data is uploaded to any server.
QR codes have a wide range of applications in modern life and work. Here are some typical use cases:
Quick WiFi Connection: In cafes, restaurants, and offices, generate a QR code with WiFi credentials and print it for display. Customers simply scan it with their phone camera to automatically connect to the network without manually typing complex passwords. This is especially useful for businesses that frequently receive visitors, offering both convenience and password security.
Marketing Campaigns: Generate standard QR codes for event pages, coupon links, or social media profiles, then print them on posters, flyers, product packaging, or business cards. Users can scan to jump directly to the target page, significantly improving conversion rates. Compared to traditional short links, QR codes are much easier to distribute on physical media.
Digital Business Cards: Encode contact information, email, and personal website into a vCard-format QR code printed on physical business cards. Recipients can scan and instantly save the details to their contacts, avoiding manual entry errors. This is highly practical in business networking situations and is the standard approach for digital business cards.
QR Code Technical Principles: QR Code (Quick Response Code) is a matrix barcode invented by Denso Wave in Japan in 1994. It consists of a square grid of black modules that can store information in both horizontal and vertical directions. QR Code supports four encoding modes: numeric, alphanumeric, byte/binary, and Kanji. The maximum version (Version 40) can hold approximately 7,000 numeric characters or 4,000 alphanumeric characters.
Error Correction Mechanism: QR Code incorporates Reed-Solomon error correction, which allows data recovery even when parts of the code are damaged or obscured. Error correction levels are L (~7%), M (~15%), Q (~25%), and H (~30%). Higher levels allow the code to tolerate more damage, but also require more modules to encode the same amount of data.
QR Code Security Tips: Although QR codes themselves do not contain malicious code, scanning QR codes from unknown sources can pose security risks. Attackers may encode malicious URLs into QR codes to trick users into visiting phishing sites or downloading malware. We recommend users preview the link address using their phone's built-in camera preview before scanning unknown QR codes, and only proceed after confirming the URL is safe.
No. This tool runs entirely in your browser using the QRCode.js library. All data processing happens locally on your device, and no data is ever uploaded to any server.
We support text, URL, WiFi network, email address, phone number, and SMS message QR codes. WiFi QR codes can be scanned by phone cameras to automatically connect to networks.
The error correction level determines how much of the QR code can be damaged while still remaining readable. Levels are L (7%), M (15%), Q (25%), and H (30%). For example, level H allows up to 30% of the code to be obscured.
Yes. You can customize both the foreground (dot) color and background color, as well as the margin size. However, please note that very low contrast may make the QR code unscannable.
Yes. QR codes generated with this tool are free of copyright restrictions and can be used for both commercial and personal purposes without attribution.
Currently, QR codes are downloaded as PNG images. PNG format supports transparency and is suitable for a wide range of uses including print and digital display.
This tool supports sizes from 100px to 800px. Generally, 300px to 400px is sufficient for most printing and screen display needs.
Common reasons include: low color contrast, too small size, incorrect error correction level, partial obstruction of the code, or special characters in the input. We recommend keeping sufficient contrast between foreground and background colors and using a higher error correction level.