# Concatenate

The **Concatenate** function takes a list of PDF filenames and concatenates them all into a single document, in the order they were specified.

{% hint style="info" %}

> **Note:**\
> The concatenation function does not load protected PDF files; if any of the input files require a password or certificate to open, the protection should first be removed using the "Change protection" operation.
> {% endhint %}

***

## Properties <a href="#properties" id="properties"></a>

### Input file paths <a href="#input-file-paths" id="input-file-paths"></a>

List of PDF files to concatenate to the output file.

Click **...** to open the List Editor to add one or more file paths to the list.

### Output file path <a href="#output-file-path" id="output-file-path"></a>

Path to the PDF file to write to.


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