Can I generate a Wi-Fi QR code for guests to connect without typing passwords?

Yes. Select the Wi-Fi mode, enter your network SSID and WPA password, and generate the QR code. When scanned by any smartphone camera, the guest connects automatically.

What formats can I download the QR code in?

You can download high-density PNG raster images for digital screens or infinite-resolution vector SVG files for physical printing and signage.

Custom QR Code Generator

Create high-resolution, client-side QR codes for websites, home/office Wi-Fi login, vCard digital business cards, email, and phone calls.

100% Client-Side

⚡ Wi-Fi Auto-Connect Rule: Scanning a Wi-Fi QR code uses the standardized WIFI:T:WPA;S:MyNetwork;P:MyPassword;; protocol. Guests can point their iPhone or Android camera at the QR code to join your Wi-Fi instantly without typing complex passwords.

Website or Landing Page URL: Enter a complete web address including https://.

Text Content or Note:

Network Name (SSID):

Wi-Fi Password:

Security Encryption:

Hidden SSID Network

First Name:

Last Name:

Phone Number:

Email Address:

Company / Organization:

Job Title:

Website / Portfolio:

Recipient Email:

Subject Line:

Pre-filled Message Body:

Telephone Number: Include country calling code (e.g. +1, +44, +971).

Recipient Phone Number:

SMS Text:

Design & Export Options

QR Code Color:

Foreground

Background Color:

Background

Resolution / Export Size:

Error Correction Level:

Live QR Code Preview

https://www.sys-metrics.com

How QR Codes Work: Anatomy and Reed-Solomon Error Correction

A QR Code (Quick Response Code) is a two-dimensional matrix barcode invented in 1994 by Denso Wave. Unlike standard 1D linear barcodes that store data in one direction, QR codes store binary information across both horizontal and vertical axes, enabling up to 7,089 numeric characters or 4,296 alphanumeric characters in a compact grid.

Error Correction Level	Data Recovery Capacity	Recommended Use Case
Level L (Low)	~7% of codewords can be restored	Clean digital screens, web links, lowest density matrix.
Level M (Medium - Default)	~15% of codewords can be restored	General business use, flyers, product packaging, Wi-Fi stickers.
Level Q (Quartile)	~25% of codewords can be restored	Industrial environments where scuffing or dust may obscure modules.
Level H (High)	~30% of codewords can be restored	Printing on outdoor signage or embedding centered logos without scan failure.

Key QR Structural Elements

Finder Patterns: The three distinct concentric squares located at the top-left, top-right, and bottom-left corners define orientation, size, and tilt angle for scanner optics.
Alignment Patterns: Small sub-squares distributed throughout larger matrix versions to correct spherical distortion on curved surfaces (e.g. bottles or coffee cups).
Timing Patterns: Alternating dark and light modules running between finder patterns to coordinate matrix grid coordinate calculations.
Quiet Zone: The 4-module wide margin of empty light space surrounding the perimeter required for scanner edge detection.

Best Practices for High-Scannability QR Codes

Maintain Strong Contrast: Always ensure high contrast between the dark foreground modules and light background. Never invert colors (light modules on dark background confuse older camera sensors).
Keep URLs Concise: Longer URLs create denser matrices with tinier dots that are harder for smartphone cameras to focus on from a distance.
Use Vector SVG for Print: When printing on business cards, posters, or physical signage, download the Vector SVG format to ensure infinite sharpness without pixelation.