Merge Multiple PDF Files with CustomJS API - n8n Workflow | Neura Market
Merge Multiple PDF Files with 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](https://www.npmjs.com/package/@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**
### 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 the size of PDF files exceeds 6MB, you can simply pass an array of URLs for PDF files.
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### Usage
### Get API key from [customJS](https://www.customjs.space)
- Sign up to the customJS platform.
- Navigate to your profile page.
- Press the Show button to get the API key.
### Set Credentials for CustomJS API on n8n
Copy and paste your API key generated from CustomJS here.
### Design workflow
- A Manual Trigger for starting the 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 the merged PDF file.
You can replace the 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 the webhook. Simply replace the 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.
Platform
n8n
Category
File & Document Management
Price
Free
Creator
CustomJS
merge
httpRequest
manualTrigger
readWriteFile
mergePdfs
How to import this workflow into n8n
1Purchase or download the workflow to get the n8n workflow JSON file.
2In your n8n instance, open Workflows and choose "Import from File" (or paste the JSON with Ctrl+V on the canvas).
3Open each node marked with a credential warning and connect your own accounts and API keys.
4Run the workflow once manually to verify the data flow, then toggle it to Active.