---
title: "How Do I Merge PDF Files Using the External Tool? - Lasernet Developer"
slug: "how-do-i-merge-pdf-files-using-the-external-tool"
description: "The article describes how to merge PDF files. The Combiner, available in most Engines and Output modules, does not support merging jobs containing PDF data. "
updated: 2026-03-04T09:58:28Z
published: 2026-03-04T09:58:28Z
canonical: "kb.lasernetgroup.com/how-do-i-merge-pdf-files-using-the-external-tool"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://kb.lasernetgroup.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How Do I Merge PDF Files Using the External Tool?

This article describes how to merge two PDF files. The **Combiner**, which is available in most **Engines** and **Output** modules, has no support for merging jobs containing PDF data. None of the modules in the Lasernet Document Management suite has such functionality included.

A third-party application must be added separately. An application that can merge PDF documents from a command line can be executed via the **Process Engine**.

The **Process Engine** is used for running external processes. These processes can have data from Lasernet as input and produce output that is entered back into Lasernet.

In this example, a command-line tool will be added to the **Process Engine** with the following parameters:

`pdfmerge.exe { [options] inputfile } [options] outputfile`

| **Setting** |  |
| --- | --- |
| Command line | pdfmerge.exe %1 "C:\PDF Documents\document.pdf" %2 |
| Working directory | C:\Program Files\PDF Merge |
| Required Exit Code | 0 (value for exit code can vary from application to application) |
| Input data | General file |
| Output file | Read file |
| Input extension | PDF |
| Output extension | PDF |

This will merge **Jobdata**, containing PDF data, with a PDF document stored on a file location. **JobInfo** substitution is supported in the command line, for setting up dynamic file location and file name.

#### Additional Information

A commercial PDF Merging tool is available from this web site:

[http://www.pdf-tools.com/pdf/pdf-command-line-suite-shell.aspx](http://www.pdf-tools.com/pdf/pdf-command-line-suite-shell.aspx)

> [!NOTE]
> Note
> 
> This link has no commercial interest for the Lasernet Group.