QR Code

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20 Sep 2026 - Nicola Asuni

Denso Wave designed the QR Code in 1994 to track parts on a production line, and its three finder patterns are why a phone can read one at any angle. Forty versions, from 21 modules square to 177, and four error correction levels that trade capacity for damage tolerance: L recovers about 7 per cent of the symbol, H about 30.

Leave the version at 0 and the library picks the smallest symbol the data fits. QR Code is a registered trademark of DENSO WAVE INCORPORATED.

Type Token

Item	Value
Type token	`QRCODE`
Enum case	`BarcodeType::QRCODE`
Family	2D
Standard	ISO/IEC 18004
Class	`\Com\Tecnick\Barcode\Type\Square\QrCode`

Input

Item	Value
Character set	any byte sequence; the encoder switches between numeric, alphanumeric, byte and kanji modes
Length	up to 7089 digits, 4296 alphanumeric characters or 2953 bytes, depending on version and error correction
Check	Reed-Solomon error correction, computed by the library
Extra parameters	7 (see below)

Extra Parameters

Appended to the type token after commas, as in QRCODE,H.

Position	Meaning	Values	Default
1	error correction level	`L`, `M`, `Q`, `H`	`L`
2	encoding mode	`NL`, `NM`, `AN`, `8B`, `KJ`, `ST`	`8B`
3	version	0 for automatic, or 1 to 40	0
4	case sensitivity	`1` or `0`	`1`
5	random mask count	number of masks to try	unset
6	best mask search	`1` or `0`	`1`
7	default mask	0 to 7	2

Examples

Digits at the default error correction level

<?php

require_once __DIR__ . '/vendor/autoload.php';

$barcode = new \Com\Tecnick\Barcode\Barcode();
$bobj = $barcode->getBarcodeObj(
    type: 'QRCODE',
    code: '0123456789',
    width: -4,
    height: -4,
    color: 'black',
    padding: [0, 0, 0, 0],
)->setBackgroundColor('white');

echo $bobj->getInlineSvgCode();

QR Code barcode encoding 0123456789

A URL at the highest error correction level

$bobj = $barcode->getBarcodeObj(
    type: 'QRCODE,H',
    code: 'https://tcpdf.org',
    width: -4,
    height: -4,
    color: 'black',
    padding: [0, 0, 0, 0],
)->setBackgroundColor('white');

QR Code barcode encoding https://tcpdf.org

A fixed version 4 symbol, larger than the data needs

$bobj = $barcode->getBarcodeObj(
    type: 'QRCODE,M,NL,4',
    code: 'tc-lib-barcode',
    width: -4,
    height: -4,
    color: 'black',
    padding: [0, 0, 0, 0],
)->setBackgroundColor('white');

QR Code barcode encoding tc-lib-barcode

Errors

These payloads raise \Com\Tecnick\Barcode\Exception:

Payload	Message
``	Empty input