Blog Post

How to Duplicate a PDF Page Using PHP

Vyom Srivastava
Illustration: How to Duplicate a PDF Page Using PHP

In this post, you’ll learn how to duplicate specific PDF pages using our Duplicate PDF Page PHP API. With our API, you’ll be able to process up to 100 PDF files per month for free. All you need to do is create a free account to get access to your API key.

Duplicating a PDF page allows you to perform operations on a page like watermarking and flattening before sending the pages to different sources. For instance, destination A needs the page with watermarks, while destination B needs the same page merged with another PDF but without watermarks — and you can use our Duplicate PDF API to achieve this.

Additionally, you can duplicate pages to serve as a backup. This is useful if you perform multiple operations on a PDF but you’re unsure what the final output might be and you want to preserve the original.

With our Duplicate PDF Page API, you’ll be able to automate this process in your workflow.

PSPDFKit API

Duplicating a PDF page is just one of our 30+ PDF API tools. You can combine our duplication tool with other tools to create complex document processing workflows, such as:

  • Converting MS Office files and images into PDFs and then duplicating specific pages

  • Merging several PDFs into one and then duplicating a specific page

  • Watermarking, splitting, or flattening PDFs and duplicating pages before or after

Once you create your account, you’ll be able to access all our PDF API tools.

Step 1 — Creating a Free Account on PSPDFKit

Go to our website, where you’ll see the page below, prompting you to create your free account.

Free account PSPDFKit API

Once you’ve created your account, you’ll be welcomed by the page below, which shows an overview of your plan details.

Free plan PSPDFKit API

As you can see in the bottom-left corner, you’ll start with 100 documents to process, and you’ll be able to access all our PDF API tools.

Step 2 — Obtaining the API Key

After you’ve verified your email, you can get your API key from the dashboard. In the menu on the left, click API Keys. You’ll see the following page, which is an overview of your keys:

Duplicate PDF Page PHP API Key

Copy the Live API Key, because you’ll need this for the Duplicate PDF Page PHP API.

Step 3 — Setting Up Folders and Files

Now, create a folder called duplicate_pdf and open it in a code editor. For this tutorial, you’ll use VS Code as your primary code editor. Next, create two folders inside duplicate_pdf and name them input_documents and processed_documents.

Then, in the root folder, duplicate_pdf, create a file called processor.php. This is the file where you’ll keep your code. Make sure to put your PDF files inside the input_documents folder.

Your folder structure will look like this:

duplicate_pdf
├── input_documents
├── processed_documents
└── processor.php

Step 4 — Writing the Code

Open the processor.php file and paste the code below into it:

<?php

$FileHandle = fopen('processed_documents/result_php.pdf', 'w+');

$curl = curl_init();

$instructions = '{
  "parts": [
    {
      "file": "document",
      "pages": {
        "start": 0,
        "end": 0
      }
    },
    {
      "file": "document"
    },
    {
      "file": "document",
      "pages": {
        "start": -1,
        "end": -1
      }
    }
  ]
}';

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://api.pspdfkit.com/build',
  CURLOPT_CUSTOMREQUEST => 'POST',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_POSTFIELDS => array(
    'instructions' => $instructions,
    'document' => new CURLFILE('input_documents/document.pdf')
  ),
    CURLOPT_HTTPHEADER => array(
      'Authorization: Bearer YOUR_API_KEY_HERE' // Replace YOUR_API_KEY_HERE with your API key.
    ),
    CURLOPT_FILE => $FileHandle,
  ));

$response = curl_exec($curl);

curl_close($curl);

fclose($FileHandle);

ℹ️ Note: Make sure to replace YOUR_API_KEY_HERE with your API key.

Code Explanation

You first create a FileHandle variable called $FileHandle. Then, you initiate the curl library and create the instructions:

{
  "parts": [
    {
      "file": "document",
      "pages": {
        "start": 0,
        "end": 0
      }
    },
    {
      "file": "document"
    },
    {
      "file": "document",
      "pages": {
        "start": -1,
        "end": -1
      }
    }
  ]
}

This duplicates the first and the last page of the PDF and adds it as a new page at the end of the PDF file. After that, you make the API call to the Duplicate PDF endpoint, the response of which is stored in the processed_documents folder.

Output

To execute the code, run the command below:

php processor.php

On successful execution, you’ll see a new processed file, result_php.pdf, located in the processed_documents folder.

The folder structure will look like this:

duplicate_pdf
├── input_documents
├── processed_documents
|    └── result_php.pdf
└── processor.php

Final Words

In this post, you learned how to easily and seamlessly duplicate PDF pages for your PHP application using our Duplicate PDF Page API.

You can integrate these functions into your existing applications to duplicate PDF pages. With the same API token, you can also perform other operations, such as merging documents into a single PDF, adding watermarks, and more. To get started with a free trial, sign up here.

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