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Merge multiple PDF files with CustomJS API

CustomJSCustomJS
1048 views
2/3/2026
IterationData ProcessingHTTP RequestBatch ProcessingAPI Integration
Official Page

workflow.png This n8n template demonstrates how to download multiple PDF files from public URLs and merge them into a single PDF using the PDF Toolkit from www.customjs.space.

@custom-js/n8n-nodes-pdf-toolkit

Notice

Community nodes can only be installed on self-hosted instances of n8n.

What this workflow does

  • Downloads each PDF using an HTTP Request.
  • Populates files into an array with Merge node from n8n.
  • Merges all downloaded PDFs using the Merge PDF node from the @custom-js/n8n-nodes-pdf-toolkit.
  • Writes the final merged PDF to disk.

Requirements

  • Self-hosted n8n instance
  • CustomJS API key for merging multiple PDF files.
  • PDF files to be merged to be converted into a PDF

Workflow Steps:

  1. Manual Trigger:

    • Runs with user interaction.

  2. HTTP Request Node For PDF Download:

    • Pass urls for PDF files to merge.

  3. Merge Node For Array Population:

    • Just populates two files into an array.

  4. Merge PDF files:

    • Uses the CustomJS node to merge the incoming PDF files into a single PDF file.
    • If size of PDF files exceeds 6MB, you can simply pass an array of URLs for PDF files.

Usage

Get API key from customJS

  • Sign up to customJS platform.
  • Navigate to your profile page
  • Press "Show" button to get API key 1.png

Set Credentials for CustomJS API on n8n

Copy and paste your API key generated from CustomJS here. 2.png

Design workflow

  • A Manual Trigger for starting workflow.
  • Two HTTP Request Nodes for downloading PDF files.
  • A Merge Node for populating files as an array.
  • Merge PDFs node for merging files
  • Write to Disk node for saving merged PDF file.

You can replace logic for triggering and returning results. For example, you can trigger this workflow by calling a webhook and get a result as a response from webhook. Simply replace Manual Trigger and Write to Disk nodes.

Perfect for

  • Bundling reports or invoices.
  • Generating document sets from external sources.
  • Automating PDF handling without writing custom code

Merge Multiple PDF Files with CustomJS API

This n8n workflow demonstrates how to merge multiple PDF files using a custom API, then save the resulting merged PDF to disk. It's designed to be triggered manually and showcases interaction with an external service for PDF manipulation.

What it does

This workflow performs the following steps:

  1. Starts Manually: The workflow is initiated by a manual trigger, allowing you to run it on demand.
  2. Makes an HTTP Request: It sends an HTTP POST request to a specified API endpoint (likely a CustomJS API) to merge PDF files. The request body would typically contain the data or URLs of the PDF files to be merged.
  3. Saves Merged PDF: The binary data received from the API response (which is expected to be the merged PDF file) is then saved to disk using the "Read/Write Files from Disk" node.

Prerequisites/Requirements

  • CustomJS API: An external API endpoint capable of receiving PDF file data (or references) and returning a merged PDF as binary data. This API is not part of the n8n workflow and needs to be hosted separately.
  • n8n Instance: A running n8n instance to host and execute this workflow.

Setup/Usage

  1. Import the Workflow: Import the provided JSON into your n8n instance.
  2. Configure the HTTP Request Node:
    • Open the "HTTP Request" node.
    • Set the URL to your CustomJS API endpoint for merging PDFs.
    • Configure the Method (likely POST).
    • Adjust the Body Parameters to send the necessary data for your PDF files to the API. This might involve passing file names, URLs, or binary data of the PDFs you wish to merge.
  3. Configure the Read/Write Files from Disk Node:
    • Open the "Read/Write Files from Disk" node.
    • Ensure the Operation is set to Write.
    • Specify the File Name and File Path where you want to save the merged PDF. You can use expressions to dynamically generate the file name (e.g., merged_{{ $now() }}.pdf).
  4. Execute the Workflow: Click "Execute Workflow" in the n8n editor to run the workflow manually and test the PDF merging process.

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