How to Use This Tool 使用说明

1. Enter text or a URL in the input field.
2. Optionally adjust the QR code size and error correction level (L, M, Q, H).
3. The QR code is generated instantly in your browser.
4. Click Download PNG to save the QR code as an image file.
5. All generation happens locally — no data is sent to any server.

1. 在输入框中输入文本或网址。
2. 可选调整二维码尺寸和纠错等级（L、M、Q、H）。
3. 二维码在浏览器中即时生成。
4. 点击 下载 PNG 将二维码保存为图片文件。
5. 所有生成都在本地完成——不会发送数据到任何服务器。

Frequently Asked Questions 常见问题

• What are the error correction levels? — L (Low) = ~7% recovery, M (Medium) = ~15%, Q (Quartile) = ~25%, H (High) = ~30%. Higher levels allow the QR code to be read even if partially damaged, but increase the code density.
• How much data can a QR code hold? — A standard QR code can hold up to 4,296 alphanumeric characters or 7,089 numeric characters. With higher error correction, the capacity decreases.
• Will the QR code expire? — No. A QR code is simply a visual encoding of data — it does not expire. However, if the QR code encodes a URL, the website at that URL may change or go offline.

• 纠错等级是什么意思？ — L（低）≈ 7% 恢复能力，M（中）≈ 15%，Q（四分之一）≈ 25%，H（高）≈ 30%。等级越高，即使二维码部分损坏也能读取，但代码密度会增加。
• 二维码能存多少数据？ — 标准二维码最多可存储 4,296 个字母数字字符或 7,089 个数字字符。纠错等级越高，容量越小。
• 二维码会过期吗？ — 不会。二维码只是数据的可视化编码——它本身不会过期。但如果二维码编码的是 URL，该网站可能会更改或下线。