HTML and URL to PDF Converter API

API ID 12962

Convert any HTML string or live webpage URL into a pixel-perfect PDF using a real headless Chromium engine. Full modern CSS support (flexbox, grid, web fonts, background graphics), custom page sizes (A4, Letter, Legal and more), adjustable margins, landscape orientation, and scaling. Returns a downloadable PDF URL. Production-ready, fast, and reliable for invoices, reports, tickets, contracts, and any document automation workflow.

1,502 ms avg response

API Documentation

Endpoints

Request

The "Convert HTML or URL to PDF" endpoint allows users to transform HTML content or web pages (defined by URLs) into professionally formatted PDF documents. This functionality is particularly beneficial for applications that require the generation of printable documents, such as invoices, reports, or user manuals from dynamic web content. Upon successful conversion, the endpoint returns a downloadable PDF file, while also providing options to customize the output, including page size, margins, and orientation. Potential use cases for this endpoint span across e-commerce platforms generating transaction receipts, educational institutions creating course materials, or businesses producing marketing brochures, ensuring users can easily replicate and distribute content in a universally accessible format.

Endpoint ID: 25879
POST https://zylalabs.com/api/12962/html+and+url+to+pdf+converter+api/25879/convert+html+or+url+to+pdf
INPUT PARAMETERS

Convert HTML or URL to PDF — Endpoint Features

Object Description
Request Body Required Text Plain

Free test requests remaining: 3 of 3.


INPUT PARAMETERS

API EXAMPLE RESPONSE
JSON
{"success":true,"url":"https://pub-6db99bab215e44889f46c4b2a619f8c5.r2.dev/html_to_pdf/20260619/79d194ed-dfd7-42a0-8d27-51c71eec225b.pdf","source":"html","page_format":"A4","output_bytes":13372,"processing_time":"1484ms"}
Convert HTML or URL to PDF — CODE SNIPPETS

curl --location --request POST 'https://zylalabs.com/api/12962/html+and+url+to+pdf+converter+api/25879/convert+html+or+url+to+pdf' --header 'Authorization: Bearer YOUR_API_KEY' 

--data-raw '{
  "html": "

Invoice 1024

Amount due: $499.00

", "page_format": "A4" }'

API Access Key & Authentication

After signing up, every developer is assigned a personal API access key, a unique combination of letters and digits provided to access to our API endpoint. To authenticate with the HTML and URL to PDF Converter API simply include your bearer token in the Authorization header.

Headers
Header Description
Authorization Required Should be Bearer access_key. See "Your API Access Key" above when you are subscribed.

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Overview

The HTML and URL to PDF Converter API converts raw HTML content or public webpage URLs into PDF documents. The API renders content using a Chromium-based browser engine, allowing generated PDFs to closely match how content appears in a modern web browser.

Users can provide either an HTML string or a public URL as input. The API processes the content, renders the page, and returns a downloadable URL for the generated PDF along with information about the generated file.

The API supports modern web technologies commonly used in websites and web applications, including CSS Flexbox layouts, CSS Grid, custom web fonts, SVG graphics, responsive layouts, background images, background colors, and JavaScript-rendered content. This makes it suitable for generating PDFs from dynamic pages, dashboards, reports, invoices, tickets, receipts, contracts, forms, and other HTML-based documents.

Several rendering options are available to control the appearance of the generated PDF. Users can select page formats such as A4, A3, Letter, Legal, and other standard paper sizes. Additional options include landscape orientation, custom margins, scale adjustment, and background printing support.

The API also supports configurable page loading strategies. Developers can choose when rendering should begin by using load, domcontentloaded, or networkidle events. This is useful when generating PDFs from pages that load data dynamically through JavaScript or external APIs.

Common use cases include:

  • Converting HTML templates into downloadable PDF files

  • Generating invoices and billing documents

  • Creating reports from web applications

  • Exporting dashboards and analytics pages

  • Converting receipts and order confirmations

  • Generating contracts and agreements

  • Creating certificates and tickets

  • Capturing public webpages as PDF documents

  • Archiving web content

  • Automating document generation workflows

Features:

  • Convert HTML content to PDF

  • Convert public URLs to PDF

  • Chromium-based rendering

  • Support for modern CSS features

  • JavaScript page rendering

  • Custom page formats and sizes

  • Adjustable margins

  • Landscape and portrait orientation

  • Background image and color support

  • Custom scaling options

  • Downloadable PDF output

  • JSON response format

  • HTTPS-based API access

The API accepts JSON requests and returns structured JSON responses containing a secure URL to the generated PDF. It can be integrated into web applications, mobile applications, SaaS platforms, automation systems, reporting tools, document management solutions, and workflow processing services that require PDF generation from HTML or web content.

HTML and URL to PDF Converter API FAQs

The endpoint returns a structured JSON response containing a success status, a secure URL to the generated PDF, the source of the content (HTML or URL), the page format used, the size of the output in bytes, and the processing time taken for the conversion.

The key fields in the response data include "success" (boolean), "url" (string), "source" (string), "page_format" (string), "output_bytes" (integer), and "processing_time" (string). These fields provide essential information about the conversion result.

Users can customize their requests by specifying parameters such as the HTML string or URL to convert, page format (e.g., A4, Letter), margins, orientation (landscape or portrait), and scaling options. These parameters allow for tailored PDF generation.

The response data is organized in a JSON format, with key-value pairs representing the conversion result. This structure allows users to easily access specific information, such as the PDF URL and processing details, for further use in applications.

Typical use cases include generating invoices, reports, tickets, contracts, and receipts from HTML content or URLs. It is also useful for archiving web content, creating certificates, and automating document generation workflows in various applications.

Users can utilize the returned data by accessing the "url" field to download the generated PDF. The "processing_time" can help assess performance, while the "output_bytes" field indicates the file size, which can be useful for storage considerations.

Data accuracy is maintained through the use of a real headless Chromium engine, which renders the HTML or URL content as it would appear in a modern web browser. This ensures that the generated PDF closely matches the original content's appearance.

Standard data patterns include a "success" field indicating whether the conversion was successful, a valid "url" for the PDF, and consistent values for "page_format" and "output_bytes." Users can expect these patterns for reliable integration into their applications.

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