glu
How-tos
Barcodes

Generate barcodes

This recipe puts EAN-13, Code 128, and QR codes into a PDF with the <barcode> element. The codes are generated as vector graphics directly in the PDF, so they stay crisp at any print resolution. Since raw HTML is allowed inside Markdown, the element works in both Markdown and HTML documents.

Rendered page with EAN-13, Code 128, and QR codes

Full example: glu/markdown/barcodes

The whole document 

---
title: Barcode Examples
lang: en
---

# Barcodes in glu

## EAN-13

<barcode type="ean13" value="4006381333931" width="4cm" height="2cm"/>

## Code 128

<barcode type="code128" value="ABC-12345" width="5cm" height="1.5cm"/>

## QR Code

<barcode type="qr" value="https://boxesandglue.dev" width="3cm"/>

QR code with high error correction:

<barcode type="qr" value="https://boxesandglue.dev" width="3cm" eclevel="H"/>

Run it 

glu barcodes.md

Attributes

Attribute Purpose
type ean13, code128, or qr
value The encoded content (digits for EAN-13, any text for Code 128 and QR)
width, height Rendered size; QR codes are square, so width alone suffices
eclevel QR error correction level (L, M, Q, H); higher levels survive more damage

Dynamic values work the usual way: an inline expression such as value="{= order_number =}" fills the barcode from Lua data, which is how the ZUGFeRD invoice pattern would add a scannable payment code.

Related

Chart from dataTeX math