什么是二维码？
二维码（QR Code，Quick Response Code）是一种矩阵式条码，由日本 Denso Wave 公司于 1994 年发明。二维码可以存储比传统条码更多的信息，包括文字、URL、数字等，并且可以被智能手机摄像头快速扫描识别。
本工具的特点：
- 实时生成：输入文本后自动生成二维码
- 多种尺寸：支持 150px 到 400px 的输出尺寸
- 下载 PNG：一键下载生成的二维码图片
- 本地生成：所有计算在浏览器本地完成，数据不上传
常见用途：分享网址链接、Wi-Fi 密码、联系方式、电子名片、支付码等。
What is a QR Code?
A QR Code (Quick Response Code) is a matrix barcode invented by Denso Wave in 1994. QR codes can store more information than traditional barcodes, including text, URLs, and numbers, and can be quickly scanned by smartphone cameras.
Features:
- Real-time Generation — Automatically generates QR code as you type
- Multiple Sizes — Supports output sizes from 150px to 400px
- Download PNG — One-click download of the generated QR code image
- Local Generation — All computation is done locally in your browser, no data uploaded
Common uses: sharing URLs, Wi-Fi passwords, contact information, business cards, payment codes, etc.