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 that can be easily recognized by smartphones or 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 types of data—such as text, URLs, and contact details—into a black-and-white (or custom-colored) dot pattern. 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 four levels of error correction capability: L (Low), M (Medium), Q (Quartile), and H (High). You can choose the appropriate level based on print quality or environmental interference to improve fault tolerance.
• Flexible Custom Colors: You can independently set the foreground color (the data modules) and the background color of the QR code. This breaks the traditional black-and-white limitation to meet your brand or visual design needs.
• Supports Logo Uploads: Embed a custom logo image in the center of your QR code to create a more recognizable and branded design. The tool ensures the core scannable areas remain 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 the appropriate level from the "Error Correction Level" 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 your QR code. Once you are satisfied, right-click the image to save it to your device.

Frequently Asked Questions (FAQ)

Q: What does the error correction level mean? Which one should I choose?
The error correction level determines the QR code's ability to be correctly scanned even if parts of it are damaged or obscured. The levels from lowest to highest are L (approx. 7% restoration), M (15%), Q (25%), and H (30%). If the QR code will be printed and posted, or might be partially covered, we recommend choosing Level Q or H. If it will only be shared on screens in a clean environment, 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 homepage, 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 content is accurate, as it cannot be directly modified after generation. We recommend uploading a logo with moderate dimensions and a clean background; overly large or complex logos may affect scanning readability. 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 Level 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 as "WIFI:T:WPA;S:Conference;P:Pass1234;;" into a QR code and printing it on venue signage. Attendees can simply scan the code to automatically connect to the network, avoiding the hassle of manually typing passwords. When designing colored QR codes, you must follow QR code specifications and ensure the finder patterns (the three square blocks in the corners) are not recolored or covered, as they are critical for scanning devices to successfully locate and decode the image.