Merge multiple PDF files with Nutrient Document Web Servi...

This tutorial shows you how to merge two PDF files into a single document using the Nutrient Document Web Services API on Zapier. This is ideal for combining reports, contracts, scanned documents, or any multi-part PDFs into one file.

What is Zapier?

Zapier(opens in a new tab) is a no-code automation platform that lets you connect apps like Google Drive, Gmail, and Slack to build automated workflows. You create “Zaps” that consist of triggers and actions between connected services.

In this tutorial, you’ll build a Zap that merges two PDF files into one using Nutrient DWS Processor API.

What is Nutrient DWS Processor API?

Nutrient Document Web Services API helps you automate document workflows — from merging, converting, signing, OCR, and more. With a free account(opens in a new tab), you get 50 credits to test all tools.

You can build powerful workflows without code using Zapier and Nutrient.

What you’ll need

A Zapier(opens in a new tab) account (a pro plan is necessary for multistep Zaps)
A Google Drive account
Two PDF files stored in Google Drive
A Nutrient DWS Processor API key — sign up here(opens in a new tab)

Step 1 — Trigger a new file in a Google Drive folder

Select Google Drive as the trigger app.

Google Drive selected in Zapier trigger step

Choose the New File in Folder trigger event.

Select 'New File in Folder' as the trigger event

Connect your Google Drive account.
Configure the folder that contains your first PDF file.

Choose the folder for the first PDF file

Test the trigger to pull in a sample PDF.

Sample first PDF file pulled into the Zap

Step 2 — Find the second PDF in Google Drive

Add another step: Google Drive > Find File.

Add Google Drive Find File step

Set up the step to locate your second PDF:
- Filename — Your second PDF file name
- Search type — Filename contains
- Drive — Your drive

Configuring search for second PDF file

Test to confirm it locates the second file.

Test shows second PDF file found

Step 3 — Merge PDF files using Nutrient DWS Processor API

Select Nutrient Document Web Services API as the app.

Nutrient DWS Processor API selected as action app

Choose the Merge PDF action.

Action step to merge PDFs

Connect your Nutrient DWS Processor API account with your API key.

Paste API key to connect account

You can find your key in the Nutrient dashboard(opens in a new tab).

API key shown in Nutrient dashboard

Configure the action fields:
- First PDF File URL — Use the file from step 1.

Mapped merge action fields in Zapier step

Second PDF File URL — Use the file from step 2.

Mapped merge action fields in Zapier step

Output File Name — Optional (e.g. merged_document.pdf).

Make sure both PDFs are publicly accessible or Zapier has access via Google Drive.

Run a test to confirm the merge is successful.

Test showing merge completed successfully

Step 4 — Upload the merged PDF to Google Drive

Add a final step: Google Drive > Upload File.

Add Upload File to Google Drive

Configure the upload:
- Folder — Choose a destination folder like /merged.
- File — Use output from the Nutrient step.
- File Name — Optional.

Mapped merged PDF file for upload to Drive

Run a test to ensure the file uploads.

Test result showing successful upload of merged file

Conclusion

You’ve just created a Zap that merges two PDF files automatically using Nutrient DWS Processor API(opens in a new tab). This is great for workflows that involve combining cover pages with documents, appending summaries, or creating a final package from multiple files.

Expand your flow with steps like OCR or applying digital signatures.

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