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.
{"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"}
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"
}'
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.
| Header | Description |
|---|---|
Authorization
|
Required
Should be Bearer access_key. See "Your API Access Key" above when you are subscribed.
|
No long-term commitment. Upgrade, downgrade, or cancel anytime. Free Trial includes up to 50 requests.
(Save 2 months with annual billing 🎉)
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.
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.
To obtain your API key, first sign in to your account and navigate to the API you want to use. From the API's Pricing section, choose a plan and complete the subscription process. Once subscribed, return to the API page and you will see your API Access Key displayed at the top of the documentation page. You can use this key to authenticate your requests.
You can’t switch APIs during the free trial. If you subscribe to a different API, your trial will end and the new subscription will start as a paid plan.
The free trial lasts for 7 days and allows you to make up to 50 API requests.
No, the free trial is available only once, so we recommend using it on the API that interests you the most. Most of our APIs offer a free trial, but some may not include this option.
Yes. If the API offers a free trial, you will see a "Free 7-Day Trial" option in its Pricing section. The trial lasts for 7 days and allows up to 50 API requests, enabling you to evaluate the API before subscribing to a paid plan.
Zyla API Hub is like a big store for APIs, where you can find thousands of them all in one place. We also offer dedicated support and real-time monitoring of all APIs. Once you sign up, you can pick and choose which APIs you want to use. Just remember, each API needs its own subscription. But if you subscribe to multiple ones, you'll use the same key for all of them, making things easier for you.
You can monitor your API usage through the response headers included with every request:
x-zyla-api-calls-monthly-used: Shows the total number of API requests you have used during the current billing period.
x-zyla-api-calls-monthly-remaining: Shows the number of API requests you have remaining for the current billing period.
Yes, you can cancel your subscription at any time. Simply go to the Pricing section of the API you're subscribed to and click the "Unsubscribe" button.
Please note that upgrades, downgrades, and cancellations take effect immediately. Once your subscription is canceled, access to the service will end immediately, regardless of any remaining API calls in your quota.
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