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

# Combine PDF

> Merges multiple PDFs into one, in the order given.

Merges multiple PDFs into one, in the order given. Display name **"Combine PDF"**. On by default for new agents.

## Authentication and enablement

No integration. Default-on.

## Inputs

* `file_urls` (required): PDF URLs from the task or prior steps, in merge order. At least one, at most 20 per call.
* `output_filename` (optional): e.g. `report.pdf`. Default `combined.pdf`.

## Output

The merged PDF is uploaded to the task (preview + download).

## Limits and side effects

* Max 20 input PDFs per call. Batch larger sets yourself.
* Writes one new file; does not modify the inputs.

## Expected errors

* Empty `file_urls`, or more than 20 URLs.
* A URL that is not a readable PDF.