如何Generate QR Codes
Create QR codes 从文本或 URLs 具有 customizable 大小和 错误校正.
问题
你需要编码 URL 或文本为 QR 代码为 scanning 通过 mobile devices.
前置条件
- Understanding 的 QR 代码结构
- Knowledge 的错误校正级别
步骤
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1. Prepare the data to encode
Determine the content: a URL, plain text, contact info (vCard), or WiFi credentials. Keep the data as short as possible, as longer data requires a larger QR code that is harder to scan. For URLs, use short links if possible.
输入https://example.com/page输出data ready -
2. Choose error correction and size
Select an error correction level: L (7%), M (15%), Q (25%), H (30%). Higher levels allow more damage but increase size. Choose the smallest size that fits your data at the chosen error level. For printed codes, use Q or H.
输入level: M, size: 256px输出settings configured -
3. Generate and test the QR code
Generate the QR code as an image (PNG, SVG) or data URL. Test it with multiple QR scanner apps on different devices. Ensure it scans reliably at the intended display size. Add a quiet zone (white border) around the code for reliable scanning.
输入generate QR输出PNG image, tested
预期结果
scannable QR 代码图像该 encodes specified 数据.
常见错误
- QR code too dense to scan
- Reduce the data length, lower the error correction level, or increase the physical size of the printed code.
- Missing quiet zone
- QR codes require a white border (quiet zone) of at least 4 modules. Without it, scanners may fail to detect the code.
排障指引
- If scanning fails, increase the image resolution and ensure sufficient contrast (black on white).
- Test at the actual display size; a code that works on screen may be too small when printed.
安全限制
- QR codes can encode malicious URLs. Users should see the URL before visiting. Do not auto-open QR-encoded URLs.