How to render the HTML page into the file (PDF/DOCX/PNG/JPG etc.)?

Before you start, you should get yourself familiar with the article about performing file conversions via API.

You have few ways to start rendering the HTML page: from HTML file or from URL.

An HTML file should contain absolutely everything necessary to render the correct page. In this case, you may render the page via simple $API->start() request and convert the file from HTML to any other format.

If you need to render HTML with styles and images, which are located in distinct separate files - you should provide an online link pointing to your page for rendering (i.e. start render via $API->startFromURL() function)

In general, to render HTML page you should look into Quickstart example of our official PHP wrapper and compose code similar to this (Renders https://google.com/ page into the single PDF file):

<?php  
  require_once 'autoload.php';
  use \Convertio\Convertio;   
  $API = new Convertio("_YOUR_API_KEY_"); 
  $API->startFromURL('http://google.com/', 'pdf')  // Convert (Render) HTML page to PDF
      ->wait()                                     // Wait for conversion finish  
      ->download('./google.pdf')                   // Download result To local file  
      ->delete();                                  // Delete files from convertio.co hosts