Add a text or image watermark to PDF documents using C#. Load the PDF document and insert the required watermark into it. Then save the result in a convenient format such as DOCX, PDF, MD, HTML, TXT, DOC, RTF, EPUB, XPS and more, and share the watermarked document with another person. Also remove the watermark from PDF document if the watermark was previously added to the document, and the reasons for adding are not longer relevant.
With this .NET API, developers can add a watermark to PDF online. Just create the watermark using text or an image and then insert that watermark into your PDF document in C#.
Note: there is no need to install any third party applications or libraries. Therefore, our .NET software solution is very easy to use.
The given .NET SDK is also helpful to remove watermarks from PDF. Removing a watermark in PDF means that you can load the desired PDF document stamped with a text or image watermark, remove this watermark from the PDF using C#, and then save the output file in a convenient format – DOC, DOCX, PDF, JPEG, PNG, TIFF and others.
To evaluate how to add or remove a watermark in PDF with our .NET API, load the PDF and the watermark as an image or text. Then select a convenient export file format – DOC, DOCX, PDF, HTML, RTF, XPS and others.
Use the following example to see how it works:
using Aspose.Words.Cloud.Sdk;
var config = new Configuration
{
ClientId = "####-####-####-####-####",
ClientSecret = "##################"
};
var wordsApi = new WordsApi(config);
using var requestDocument = File.OpenRead("Input1.pdf");
using var requestImageFile = File.OpenRead("Input2.pdf");
var request = new InsertWatermarkImageOnlineRequest(
document: requestDocument,
imageFile: requestImageFile
);
var actual = await this.WordsApi.InsertWatermarkImageOnline(request);
var convertRequest = new ConvertDocumentRequest(actual.Document.Values.First(),
"pdf");
var convert = await wordsApi.ConvertDocument(convertRequest);using Aspose.Words.Cloud.Sdk;
var config = new Configuration
{
ClientId = "####-####-####-####-####",
ClientSecret = "##################"
};
var wordsApi = new WordsApi(config);
using var requestDocument = File.OpenRead("Input.pdf");
var requestWatermarkText = new WatermarkText()
{
Text = "This is the watermark text",
RotationAngle = 90f
};
var request = new InsertWatermarkTextOnlineRequest(
document: requestDocument,
watermarkText: requestWatermarkText
);
var actual = await this.WordsApi.InsertWatermarkTextOnline(request);
var convertRequest = new ConvertDocumentRequest(actual.Document.Values.First(),
"pdf");
var convert = await wordsApi.ConvertDocument(convertRequest);using Aspose.Words.Cloud.Sdk;
var config = new Configuration
{
ClientId = "####-####-####-####-####",
ClientSecret = "##################"
};
var wordsApi = new WordsApi(config);
using var requestDocument = File.OpenRead("Input.pdf");
var deleteWatermarkRequest = new DeleteWatermarkOnlineRequest(requestDocument);
var response = await WordsApi.DeleteWatermarkOnline(deleteWatermarkRequest);
var convertRequest = new ConvertDocumentRequest(response.Document.Values.First(),
"pdf");
var convert = await wordsApi.ConvertDocument(convertRequest);Install 'Aspose.Words Cloud SDK for .NET' using NuGet package manager. Just run nuget install Aspose.Words-Cloud to automatically install and reference the corresponding assembly in your project. As an alternative, you can manually clone Aspose.Words Cloud SDK for .NET source code from GitHub and use it in your project. Please follow these Instructions to quickly get the necessary security credentials and access our REST API.
Refer to the Repository Documentation to see more details.
You can add a watermark to a document in other formats: