What do the different QR Error Correction Levels (L, M, Q, H) mean?

Error correction allows QR codes to remain readable even if partially damaged: Level L restores up to 7% damage, Level M up to 15% (standard), Level Q up to 25%, and Level H up to 30% (recommended when placing logos or branding in the center).

How does a WiFi QR code work on smartphones?

A WiFi QR code encodes the network SSID, security type (WPA/WPA2/WEP), and password (e.g., WIFI:S:MyNetwork;T:WPA;P:MyPassword;;). When scanned with a smartphone camera, the device automatically prompts the user to join the network.

Can I download the QR code as a scalable vector SVG file?

Yes. You can download both standard high-resolution PNG images and vector SVG files, which scale infinitely for large-format billboard and poster printing.

Do generated QR codes ever expire?

No. These are static QR codes that encode your data directly into the matrix pattern. They will function permanently without subscription fees or redirect servers.

Developer Tools

QR Code Generator

Create custom, high-resolution QR codes In-Browser with color styling, error correction controls, and instant PNG/SVG vector downloads.

Website URL

QR Code Customization

QR Color

#0F172A

Background

#FFFFFF

Error Correction

Export Size

Live QR Code26 chars

100% Private. Your data never leaves your device.

FreeToolsBox • Instant & Free

What is Custom QR Code Generator?

The Custom QR Code Generator creates high-resolution, styled QR codes for websites, WiFi networks, digital business cards (vCard), plain text, email messages, and SMS prompts. It features custom color styling, four error correction levels (L, M, Q, H), and instant PNG raster or SVG vector graphic downloads in client JavaScript.

Designed for accuracy, speed, and privacy, this tool runs entirely on your local device with zero network latency.

How to Use the Custom QR Code Generator

1
Select your desired QR code payload type (URL, Plain Text, WiFi Network, vCard Contact, Email, or SMS).
2
Enter your destination content and parameters into the corresponding form inputs.
3
Customize QR code foreground and background colors, and set your desired error correction level (L, M, Q, H).
4
Preview the live generated QR code and click "Download PNG" or "Download SVG" for high-res vector output.

Formula & Calculation Logic

Encodes alphanumeric or binary payloads into standard ISO/IEC 18004 2D matrix symbology with 2D Reed-Solomon error correction polynomials.

QR_Matrix = Reed_Solomon_Encode(Payload, Version_1..40, ECC_Level_L_M_Q_H)

Custom QR Code Generator Frequently Asked Questions

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