Docs / Templates / Coupon Voucher template | HTML to Image API Docs

Coupon Voucher template

The coupon-voucher template renders a business image as a PNG. POST a JSON payload to the endpoint below and you receive a CDN URL in the response.

Endpoint

POST https://app.html2img.com/api/v1/templates/coupon-voucher
X-API-Key: <your-api-key>
Content-Type: application/json

Authentication uses the X-API-Key header. See the authentication docs for details on issuing and rotating keys.

Inputs

The full set of inputs the template accepts:

Name	Type	Required	Description	Example
`discount_text`	string	Yes	Text value for the discount text.	`20% OFF`
`code`	string	Yes	Text value for the code.	`SPRING20`
`brand_name`	string	Yes	Text value for the brand name.	`Riverside Bakery`
`expiry`	string	No	Text value for the expiry.	`Valid until June 30, 2026`
`terms`	string	No	Text value for the terms.	`One use per customer. Excludes wholesale orders.`
`logo_url`	url	No	URL of the logo to include in the rendered image.	`-`
`accent_color`	string	No	Hex colour code for the accent.	`#B45309`
`background_color`	string	No	Hex colour code for the background.	`#FFFBEB`

Defaults

Defaults applied automatically when not overridden in the request:

Option	Default value
`width`	`1200`
`height`	`600`

Code examples

curl -X POST https://app.html2img.com/api/v1/templates/coupon-voucher \
  -H "X-API-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"discount_text":"20% OFF","code":"SPRING20","brand_name":"Riverside Bakery","expiry":"Valid until June 30, 2026","terms":"One use per customer. Excludes wholesale orders.","accent_color":"#B45309","background_color":"#FFFBEB"}'

<?php
$response = \Illuminate\Support\Facades\Http::withHeaders([
    'X-API-Key' => 'YOUR_API_KEY',
])->post('https://app.html2img.com/api/v1/templates/coupon-voucher', ['discount_text' => '20% OFF', 'code' => 'SPRING20', 'brand_name' => 'Riverside Bakery', 'expiry' => 'Valid until June 30, 2026', 'terms' => 'One use per customer. Excludes wholesale orders.', 'accent_color' => '#B45309', 'background_color' => '#FFFBEB']);

$url = $response->json('url');

const response = await fetch('https://app.html2img.com/api/v1/templates/coupon-voucher', {
  method: 'POST',
  headers: {
    'X-API-Key': 'YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    "discount_text": "20% OFF",
    "code": "SPRING20",
    "brand_name": "Riverside Bakery",
    "expiry": "Valid until June 30, 2026",
    "terms": "One use per customer. Excludes wholesale orders.",
    "accent_color": "#B45309",
    "background_color": "#FFFBEB"
}),
});

const { url } = await response.json();

import requests

response = requests.post(
    'https://app.html2img.com/api/v1/templates/coupon-voucher',
    headers={'X-API-Key': 'YOUR_API_KEY'},
    json={'discount_text': '20% OFF', 'code': 'SPRING20', 'brand_name': 'Riverside Bakery', 'expiry': 'Valid until June 30, 2026', 'terms': 'One use per customer. Excludes wholesale orders.', 'accent_color': '#B45309', 'background_color': '#FFFBEB'},
)

url = response.json()['url']

Looking for a fuller integration sketch in your language? The usage guides cover PHP, Laravel, Rails, Python, JavaScript, React and Vue.

Response

A successful render returns:

{
 "success": true,
 "id": "abc123",
 "url": "https://i.html2img.com/abc123.png",
 "credits_remaining": 1234,
 "template": "coupon-voucher"
}

The url field is a CDN URL for the rendered PNG. credits_remaining tracks your monthly quota. Shared response fields are documented in the API parameters reference.

Errors

The template endpoint returns the following error responses:

422 Validation failed

Returned when one or more inputs fail validation. The errors object lists field-specific messages.

{
 "success": false,
 "error": "validation_failed",
 "errors": {
 "title": ["The title field is required."]
 }
}

404 Template not found

Returned with {"code": "template_not_found"} if the slug is not registered. Check the template list for current slugs.

401 Unauthorised

Missing or invalid API key. See the authentication docs.

429 Too many requests

You have hit the rate limit or used your monthly credits. The pricing page covers higher-volume plans.

Related templates

Invoice Image - Render full invoices as PNG images for emails, dashboards, and exports
Event Ticket - Print- and email-ready tickets with QR/barcode slot and perforated stub
Receipt Image - Compact order receipts for confirmation emails and thank-you screens
Product Card - E-commerce product cards with price, optional sale price, and CTA

See the Coupon Voucher template in our gallery for sample renders and use cases.

Documentation