Control Freak’s QR Code Generator

Text/Link

Auto Capitalize Domain?

Mix Encoding

Min Version?

min size: 21 modules?

Error Correction Level?

Auto Upgrade

Mask Pattern?

Logo

Image File

Drop your image here

Appearance

Round Off Bottom Right Modules

Corner Radius (%)

Advanced

Background Padding

Colors

Foreground

Advanced

Background

No background

Preview

Actual Content

Total Data bits

Text/Link

https://CALVIN.SH/tools/qr

Download

Download PNG size

Save Settings as Template

Template Link

Save this link to reuse your settings

Include Text/Link

Include Logo

Templates

Details & explanation

For a more detailed explanation of QR code components, please refer to the Wikipedia article .

Module

A module is a single square in a QR code.

Components of a QR code

Data Segments

Each QR code data segment begins with a 4-bit indicator that specifies the encoding mode, as shown in the table below.

Indicator	Encoding	Bits per character
`0001`	Numeric	3 1⁄3
`0010`	Alphanumeric^*	5 1⁄2
`0100`	Byte	8
`1000`	Kanji	13

^*Oddly enough, the Alphanumeric mode only supports capital letters (no lowercase), which is why this generator includes an Auto Capitalize Domain feature. Since domain names are case insensitive, converting them to uppercase has no effect on how they work on the web, but it may allow the QR code segment to switch from byte mode to alphanumeric mode and reduce the number of bits needed to encode the text.

Then a character count indicator, whose bit length varies depending on the QR code version.

**Number of bits in the Character Count Indicator**
Encoding	Ver. 1–9	Ver. 10–26	Ver. 27–40
Numeric	10	12	14
Alphanumeric	9	11	13
Byte	8	16	16
Kanji	8	10	12

The data follows immediately after.