Trình tạo mã QR miễn phí
Trình tạo mã QR miễn phí trực tuyến miễn phí. Xử lý dữ liệu tức thì trong trình duyệt của bạn. Không tải lên, không đăng ký, hoàn toàn riêng tư.
Local processingWhat is Trình tạo mã QR miễn phí?
A QR Code (Quick Response Code) is a two-dimensional barcode that stores data in a matrix of black and white squares. Unlike traditional one-dimensional barcodes that hold up to 20 characters, QR codes can store up to 7,089 numeric characters or 4,296 alphanumeric characters. They are readable by smartphone cameras and QR scanner apps, making them ideal for sharing URLs, contact information, Wi-Fi credentials, payment links, and product details.
How It Works
This generator creates QR codes entirely in your browser using a JavaScript QR encoding library. The input text or URL is encoded into a matrix following the ISO/IEC 18004 standard. Error correction is applied using Reed-Solomon coding (level L by default), allowing the code to be read even if partially damaged. The resulting matrix is rendered as an SVG or PNG image that can be downloaded. No data is sent to any server — all encoding happens locally.
Common Use Cases
- Share a website URL on printed materials — users scan to visit without typing
- Encode Wi-Fi credentials — guests scan to connect to your network instantly
- Create payment links — display QR code for mobile wallet payments (Alipay, WeChat Pay, PayPal)
- Share contact information (vCard) — scan to add to phone contacts without manual entry
- Product labeling — encode serial numbers or product URLs for inventory tracking
Technical Details
Standard: ISO/IEC 18004. Capacity: numeric 7,089 / alphanumeric 4,296 / binary 2,953 / kanji 1,817 chars. Error correction: L (7%), M (15%), Q (25%), H (30%). Reed-Solomon error correction allows partial recovery if code is damaged. Version 1 (21×21) to Version 40 (177×177). Output: SVG vector or PNG raster. All processing local — no server roundtrip.
How to Use
Enter your input above. The result updates automatically. Use the copy button to copy the result.
Privacy
All processing happens in your browser. Your data is never uploaded to any server.
FAQ
Trình tạo mã QR miễn phí này có miễn phí không?
Có, hoàn toàn miễn phí. Không cần đăng ký.
Công cụ này có tải dữ liệu của tôi lên không?
Không. Tất cả xử lý diễn ra cục bộ trong trình duyệt của bạn. Dữ liệu của bạn không bao giờ rời khỏi thiết bị.