We all understand the importance and of converting PDF files to Word document as they provide a great capability to modify the content of input PDF file. However, we may have a scenario where we need to transform MS Word document (DOC, DOCX etc.) to PDF format for long term archival. This process is followed to prevent the recipient of the document from modifying the content. This article provides a step-by-step guide on how to convert DOC to PDF in C# using .NET REST API.

Word Document Conversion API

Aspose.Words Cloud SDK for .NET enables high-quality, scalable DOC and DOCX to PDF conversion via RESTful API. It supports all Word features—styles, tables, headers, footers, images—and converts them into PDF with pixel-perfect accuracy.

Setup & Configurations

Step 1: Install Aspose.Words Cloud SDK Use NuGet to install the SDK in your C# .NET application:

Install-Package Aspose.Words-Cloud

Step 2: Get API Credentials Create an account on Aspose.Cloud Dashboard and get your Client ID and Client Secret.

Convert DOC to PDF in C#

Follow these steps to perform DOC to PDF conversion in your .NET app:

Step 1 - Initialize WordsApi:

// create Configuration instance by passing Client ID and Client secret details
var config = new Configuration { ClientId = clientID, ClientSecret = clientSecret };

// create WordsApi object
var wordsApi = new WordsApi(config);

Step 2 – Upload DOCX File to the Cloud storage:

 wordsApi.UploadFile(new UploadFileRequest(file, fileName, null));

Step 3 – Initiate DOC to PDF conversion:

GetDocumentWithFormatRequest request = new GetDocumentWithFormatRequest(fileName,format,null,null,null,null,outputfile);
wordsApi.GetDocumentWithFormat(request);
word to pdf

A preview of Word to PDF conversion.

DOCX to PDF using cURL

An alternative solution is to call the REST API directly using cURL commands. Since REST-based API architecture is compatible with any platform, so you can easily perform DOCX to PDF conversion through command prompt:

Step 1- Generate Access Token:

curl -v "https://api.aspose.cloud/connect/token" \
 -X POST \
 -d "grant_type=client_credentials&client_id=CLIENT_ID&client_secret=CLIENT_SECRET" \
 -H "Content-Type: application/x-www-form-urlencoded" \
 -H "Accept: application/json"

Step 2 – Convert DOCX to PDF:

curl -v "https://api.aspose.cloud/v4.0/words/convert?format=pdf" \
-X PUT \
-H "Authorization: Bearer <ACCESS_TOKEN>" \
-H "Content-Type: multipart/form-data" \
-d "@input-sample.docx"

Replace:

  • <ACCESS_TOKEN> with your generated bearer token.

Try Free DOCX to PDF Converter

Want to test API online before integrating into your solution?

👉 Try our Free Word to PDF Converter and convert DOC or DOCX files to PDF in your browser.

convert docx to pdf online

Free Online Word to PDF converter.

Helpful Developer Resources:

Conclusion

Using Aspose.Words Cloud SDK for .NET, you can effortlessly convert Word DOC/DOCX files to PDF in your C# applications. This cloud-native approach saves development time, ensures accurate formatting, and integrates well with enterprise workflows.

Whether you’re processing legal documents, generating invoices, or automating reports, DOC to PDF conversion with .NET REST API ensures speed, quality, and flexibility.

We highly recommend visiting the following blogs:

Frequently Asked Questions – FAQs

Can I convert PDF to Word Document?

  • Yes. You can easily perform PDF to editable Word document conversion using Aspose.Words REST API. For further details, please visit Convert PDF to Word in C#.

Do I need Microsoft Word installed?

  • No. This is a cloud-based solution and works independently of MS Office.

Is there a free trial?