In modern digital publishing, EPUB is widely used for distributing eBooks, while PDF remains the preferred choice for consistent viewing, printing, and long-term archiving. Converting EPUB to PDF ensures that eBook content renders uniformly across devices, operating systems, and screen sizes.

This guide explains how to perform EPUB to PDF conversion using C# .NET REST API, enabling developers to build reliable, cloud-based eBook processing workflows without relying on desktop software or manual intervention.

EPUB to PDF Conversion API

The Aspose.PDF Cloud SDK for .NET provides a powerful REST-based solution for converting EPUB files into professional-quality PDF documents. The API handles EPUB parsing and rendering in the cloud, producing accurate and print-ready PDFs.

Because the conversion runs entirely in the cloud, it is ideal for server-side, cross-platform, and scalable applications.

Key Advantages

  • High-fidelity EPUB to PDF conversion.
  • Fully cloud-based REST architecture.
  • Secure authentication with OAuth.
  • No dependency on desktop tools.
  • Easy integration with C# .NET applications.

Installation

Firstly, Aspose.Pdf-Cloud in NuGet packages manager and click the Add Package button. This will add the SDK reference in your project.

Secondly, obtain your client credentials from cloud dashboard. If you do not have an existing account, simply create a free account by following the instructions specified in the quick start article.

Convert EPUB to PDF in C# .NET

Follow the steps below to convert an EPUB file stored in cloud storage into a PDF document using C#.

PdfApi pdfApi = new PdfApi(clientSecret, clientID);

Create an object of PdfApi class where we pass client credentials as arguments.

var response = pdfApi.PutEpubInStorageToPdf(resultant, inputFile);

Call the API request to load the EPUB file from storage and convert it to PDF format, and saves the output back to the cloud.

epub to pdf

EPUB to PDF Conversion preview.

The sample EPUB document used in the above example can be downloaded from input.epub.

EPUB to PDF Conversion using cURL

For command-line users or automation pipelines, EPUB to PDF conversion can also be performed using direct REST API calls. The first step in this approach is to generate a JWT access token using the following command:

curl -v "https://api.aspose.cloud/connect/token" \
 -X POST \
 -d "grant_type=client_credentials&client_id=XXXXX-XXXXXXXXX-be54-33012487e783&client_secret=XXXXXXXXXXXXX" \
 -H "Content-Type: application/x-www-form-urlencoded" \
 -H "Accept: application/json"

Now, please execute the following command to convert EPUB to PDF format and save the output on local drive.

curl -v "https://api.aspose.cloud/v3.0/pdf/create/epub?srcPath={epubFile}" \
-X GET \
-H  "accept: multipart/form-data" \
-H  "authorization: Bearer {ACCESS_TOKEN}" \
-o "resultant.pdf"

Replace epubFile with the name of input MPP file available in Cloud storage and ACCESS_TOKEN with JWT access token generated above.

EPUB to PDF Converter App

In order explore the capabilities of the PDF Processing API, you may consider using our free online EPUB to PDF Conversion App.

epub to pdf converter

A preview of EPUB to PDF Conversion app.

Conclusion

Using C# .NET REST API, converting EPUB eBooks to PDF becomes a straightforward and scalable task. Whether integrated via SDK or automated using REST calls, EPUB to PDF conversion helps ensure consistent document presentation across platforms while simplifying eBook distribution and archiving.

❓ Frequently Asked Questions

  1. What is EPUB to PDF conversion?
    EPUB to PDF conversion is the process of transforming an EPUB eBook into a fixed-layout PDF document that displays consistently on all devices.
  2. Why should I convert EPUB files to PDF?
    PDF files are easier to share, print, and archive. Converting EPUB to PDF ensures stable formatting and universal accessibility.
  3. Can I convert EPUB to PDF using C# .NET?
    Yes. Aspose.PDF Cloud SDK for .NET allows you to convert EPUB files to PDF using simple REST API calls.
  4. Is any desktop software required?
    No. The entire EPUB to PDF conversion process runs in the cloud without requiring Microsoft Word, Adobe Acrobat, or other desktop tools.
  5. Is there a free way to test EPUB to PDF conversion?
    Yes. Aspose offers a free trial that lets developers test EPUB to PDF conversion before upgrading to a paid plan.

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