Barcode Generator API

Create Code 128 barcodes for labels, SKUs and shipping with a single request. SVG with human-readable text or PNG, custom height, width and colours.

GETPOSThttps://apibox.io.vn/v1/barcode

Images & Codes▶ Try it online

The Barcode API generates Code 128 barcodes, the most widely used linear barcode for shipping labels, warehouse SKUs, invoices and internal asset tags. Send GET /v1/barcode?text=ABC-12345 and receive a crisp SVG image; add format=png for a bitmap.

The encoder automatically switches between Code 128 set B (all printable ASCII characters) and set C (pairs of digits) so long numeric runs produce a compact barcode, and it calculates the check digit for you. The text can be up to 80 printable ASCII characters; accented or non-Latin characters are rejected with a clear error.

Options: height of the bars (20–600 px, default 80), module_width (1–10 px per narrow bar, default 2), foreground color and background, and show_text=false to hide the human-readable line printed under the SVG barcode (PNG output contains the bars only).

Parameters

Name	In	Type	Required	Default
`text`	body\|query	string	yes		Content to encode: printable ASCII, max 80 characters.
`format`	body\|query	string	no	`svg`	`svg` or `png`.
`height`	body\|query	number	no	`80`	Bar height in pixels (20–600).
`module_width`	body\|query	number	no	`2`	Width of the narrowest bar in pixels (1–10).
`color`	body\|query	string	no	`000000`	Bar colour (hex or basic colour name).
`background`	body\|query	string	no	`ffffff`	Background colour.
`show_text`	body\|query	boolean	no	`true`	Print the text under the barcode (SVG only).

Example

curl "https://apibox.io.vn/v1/barcode?text=ABC-12345&height=80" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -o output

const res = await fetch('https://apibox.io.vn/v1/barcode?text=ABC-12345&height=80', {
  method: 'GET',
  headers: {
    Authorization: 'Bearer YOUR_API_KEY',
  },
});
const blob = await res.blob();

import requests

res = requests.get(
    "https://apibox.io.vn/v1/barcode?text=ABC-12345&height=80",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    timeout=30,
)
open("output", "wb").write(res.content)

<?php
$ch = curl_init('https://apibox.io.vn/v1/barcode?text=ABC-12345&height=80');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => ['Authorization: Bearer YOUR_API_KEY'],
]);
$response = curl_exec($ch);
file_put_contents('output', $response);

Response

binary image/svg+xml (Code 128 barcode)

Use cases

Print shipping and warehouse labels from your order system
Generate SKU barcodes for products in an online shop or POS
Add a scannable invoice or order number to PDF documents
Tag equipment and inventory with internal asset IDs

FAQ

Which barcode symbology does the API produce?

Code 128 (sets B and C with automatic switching). It is read by virtually every handheld and camera scanner. EAN-13/UPC and 2D formats other than QR are not generated; use /v1/qr for QR codes.

Can I encode Vietnamese or other accented characters?

No. Code 128 only covers printable ASCII (codes 32–126), so the API returns an invalid_text error. Remove diacritics or encode an ID instead.

SVG or PNG – which is better for printing?

SVG is vector and stays sharp at any print size, and it includes the human-readable text. Use PNG when the target (some label printers or e-mail clients) cannot render SVG; pick a module_width of 2–4 for good scan quality.

Barcode Generator API

Parameters

Example

Response

Use cases

FAQ

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