QR Code Generator

QR Code Generator: Core Features and Principles

When you need to quickly convert a URL, contact information, or text into an image easily recognized by smartphones and barcode scanners, a QR code generator is the perfect solution. A QR code (Quick Response code) is a type of matrix barcode that encodes various data types—such as text, URLs, and contact details—into a grid of black and white (or custom-colored) squares. The core function of this tool is to encode any text you input into a standard PNG QR code image in real-time, while allowing you to adjust the error correction level, foreground color, and background color.

Why Choose Our QR Code Generator?

• Four Error Correction Levels: Offers L (Low), M (Medium), Q (Quartile), and H (High) error correction capabilities. You can choose the appropriate level based on print quality or environmental factors to improve fault tolerance.
• Flexible Custom Colors: Set the foreground color (data modules) and background color independently, breaking away from traditional black and white to meet brand or visual design needs.
• Logo Upload Support: Embed a custom logo in the center of the QR code to create a more recognizable and branded image, while the tool ensures the core scanning area remains valid.

How to Use the Tool

1. Paste or type the content you want to encode (e.g., URL, text, phone number) into the input box.
2. Select an appropriate error correction level from the dropdown menu (e.g., choose H or Q for printing).
3. Use the color picker or enter HEX color codes to set the foreground and background colors.
4. If you want to add a logo, click the upload button to select a local image file.
5. The tool will generate a real-time preview of the QR code. Once verified, right-click the image to save it to your device.

Frequently Asked Questions (FAQ)

Q: What does the QR code error correction level mean, and which one should I choose?
The error correction level determines the QR code's ability to remain scannable even if it is partially damaged or obscured. The levels range from low to high: L (approx. 7% restoration), M (15%), Q (25%), and H (30%). If the QR code will be printed on posters or might be partially covered, we recommend choosing level Q or H. For clean digital screen sharing, level L or M is sufficient.

Q: How do I create a QR code for a WeChat Official Account link?
Simply copy the full URL of the article or profile page, paste it into the tool's input box, and generate the code. For example, enter a link like "https://mp.weixin.qq.com/s/...".

Important Notes

Please ensure your input is accurate, as the QR code cannot be directly modified after generation. We recommend uploading a logo with a moderate size and a clean background; overly large or complex logos may affect scannability. When customizing colors, ensure there is enough contrast between the foreground and background (e.g., a dark foreground on a light background). The generated QR code is in PNG format. If you need an extremely high resolution, we recommend using professional image software to upscale it losslessly after generation.

Technical Notes & Best Practices

For QR codes intended for long-term use or printing, we recommend selecting a higher error correction level (such as H) and generating a sufficiently large size (e.g., 300x300 pixels or more) to account for material wear, ink bleed, or long-distance scanning. A typical use case: encoding conference Wi-Fi credentials like "WIFI:T:WPA;S:Conference;P:Pass1234;;" into a QR code and printing it on venue signage. Attendees can simply scan the code to connect to the network automatically, avoiding the hassle of typing passwords manually. When designing colored QR codes, you must adhere to QR code specifications. Ensure the finder patterns (the square "eyes" in the three corners) are not recolored or covered, as they are critical for scanning devices to successfully locate and decode the image.