Client-Side UtilityLocal memory execution • Zero server telemetry
Custom QR Code Generator
Generate standard ISO/IEC 18004 QR codes client-side in memory. Customize foreground/background colors with live WCAG contrast checking, select error correction levels, and download vector SVG or high-resolution PNG images.
DMaintained by Developer Tools
Published Last verified
0 characters • 0 UTF-8 bytes
QR Code Preview
QR Code Ready to Generate
Enter a website link, plain text, or contact details in the input field above to preview and download your QR code.
Customization & Formatting
Contrast:21:1 Strong
Error Correction LevelMax capacity: 2331 bytes
DMaintained by Developer Tools
Published Last verified
Calculation Methodology & Formula
Encodes arbitrary UTF-8 characters and binary streams into 2D matrix symbology using Reed-Solomon error correction polynomials across Versions 1 to 40.
ReedSolomon(DataStream, ErrorCorrectionLevel)Worked Example: Website URL with High Error Correction
Encode a website address with Level H error correction and download high-resolution PNG.
input:https://auditoptima.com
level:H (30% recovery)
size:256 × 256 px
Expected OutputScannable 2D Matrix Symbol
Renders scannable QR symbol with high contrast ratio and instant vector download.
Technical Constraints & Limitations
- QR Code Version 40 maximum byte capacity is 2,953 bytes at Level L and 1,273 bytes at Level H.
- Color combinations with contrast below 3.0:1 or inverted colors may not scan reliably under hardware barcode cameras.
Frequently Asked Questions
Do generated QR codes expire?
No. Static QR codes encode your exact text or URL directly into the matrix pattern. As long as your destination URL remains active, the QR code will scan indefinitely.
Is my data or destination link sent to your server?
No. All matrix computations, SVG rendering, and PNG rasterization take place locally in your web browser. No URLs or content are ever uploaded.
Which error correction level should I choose?
Level M (15% recovery) is recommended for general website URLs and text. Level H (30% recovery) is ideal if you plan to print the QR code on physical merchandise or outdoor posters.