Download and merge multiple PDFs from URLs with the CustomJS API

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Important notice

This workflow is provided as-is. Please review and test before using in production.

1. Workflow Overview

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](https:/...

Best for

File Management automation workflows
intermediate n8n builders looking for reusable templates

Tools used

n8n-nodes-base.splitout, n8n-nodes-base.httprequest, n8n-nodes-base.readwritefile, n8n-nodes-base.manualtrigger, n8n-nodes-base.code, @custom-js/n8n-nodes-pdf-toolkit.mergepdfs

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by CustomJS.

Original n8n.io source

1.1 Workflow description

Title: Download and merge multiple PDFs from URLs with the CustomJS API
Workflow name: Download and merge multiple PDFs from URLs with the CustomJS API

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

What this workflow does

Defines an array of PDF URLs.
Splits the array to process each URL individually.
Downloads each PDF using an HTTP Request.
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

A free CustomJS account. An API Key saved in n8n as credentials of type CustomJS account.

Notice

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

Usage

Get API key from customJS

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

Set Credentials for CustomJS API on n8n

Copy and paster your API key generated from CustomJS here.

Design workflow

A Manual Trigger for starting workflow.
A code node that returns URLs of PDF files as an array
Split Out node for concurrent processing
HTTP node for downloading PDF file locally
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.

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - Split Out

Type / Role: n8n-nodes-base.splitOut - splitOut
Config choices: Version 1

Block 2 - HTTP Request1

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 3 - Read/Write Files from Disk2

Type / Role: n8n-nodes-base.readWriteFile - readWriteFile
Config choices: Version 1

Block 4 - Read/Write Files from Disk3

Type / Role: n8n-nodes-base.readWriteFile - readWriteFile
Config choices: Version 1

Block 5 - When clicking ‘Test workflow’

Type / Role: n8n-nodes-base.manualTrigger - manualTrigger
Config choices: Version 1

Block 6 - PDF Array

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 7 - Merge PDF

Type / Role: @custom-js/n8n-nodes-pdf-toolkit.mergePdfs - mergePdfs
Config choices: Version 1

3. Summary Table

Workflow	Download and merge multiple PDFs from URLs with the CustomJS API
Complexity	intermediate
Nodes	7
Categories	File Management
Author	CustomJS
Published	21 Mar 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/3281/3281.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source File Management workflows

Frequently asked questions

What does Download and merge multiple PDFs from URLs with the CustomJS API do?

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](https:/...

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your File Management use case.

CustomJS

22 workflows

Nodes

n8n-nodes-base.splitout n8n-nodes-base.httprequest n8n-nodes-base.readwritefile n8n-nodes-base.manualtrigger n8n-nodes-base.code @custom-js/n8n-nodes-pdf-toolkit.mergepdfs

Complexity

intermediate

Published 21 Mar 2025

Likes 0

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Install path: /data/workflows/3281/3281.json

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Download and merge multiple PDFs from URLs with the CustomJS API

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

What this workflow does

Requirements

Notice

Usage

Get API key from customJS

Set Credentials for CustomJS API on n8n

Design workflow

Perfect for

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Split Out

Block 2 - HTTP Request1

Block 3 - Read/Write Files from Disk2

Block 4 - Read/Write Files from Disk3

Block 5 - When clicking ‘Test workflow’

Block 6 - PDF Array

Block 7 - Merge PDF

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions