This article guides how to add watermark to PPT with C# REST API. You will learn the insertion of PowerPoint watermark with C# Low Code API using a .NET-based Cloud SDK. Various options will be discussed to customize the watermark in the presentation.

Prerequisite

• Create an account API credentials
• Download Aspose.Slides Cloud SDK for Dotnet to add a watermark
• Setup C# project with the above SDK for inserting a watermark

Steps to Insert Watermark in PPT with C# REST API

1. Initialize the SlidesApi object with a client ID and secret to add a watermark
2. Create a Shape object by setting the Text and TextFrameFormat properties
3. Read the input presentation file into a stream
4. Call the CreateWatermarkOnline() method by providing the input file stream and shape
5. Save the returned stream into a local file on the disk

These steps describe how to insert a watermark in PowerPoint with C# RESTful Service. Create a shape for defining the watermark by setting the text and rotation angle. Call the CreateWatermarkOnline() method to add a watermark by providing the input presentation and the Shape object containing the watermark parameters.

Code to Create a Watermark in PowerPoint with C# REST Interface

This code demonstrates how to put a watermark in PowerPoint with C# .NET-based API. The Shape object contains a lot of characteristics that you can set to customize the watermark. Options are also available to add an image watermark in the presentation.

This article has guided us to add a watermark. If you want to generate a PowerPoint from an HTML file, refer to the article Convert HTML to PowerPoint with C# REST API.