Adding an image watermark in C# with RestSharp

In this guide, we'll show you how to add image watermarks to your PDFs using C# and the RestSharp library.

When generating PDFs, you might want to add image watermarks to your documents for protection or branding purposes.

using RestSharp;
using System.IO;
using System.Threading.Tasks;

// You can get an API key at https://pdfshift.io
var apiKey = "sk_xxxxxxxxxxxx";

var client = new RestClient("https://api.pdfshift.io/v3/convert/pdf");
var request = new RestRequest(Method.Post);
request.AddHeader("X-API-Key", apiKey);
request.AddHeader("Content-Type", "application/json");

var payload = new
{
    source = "https://www.example.com",
    // Add image watermark
    watermark = new
    {
        image = "https://example.com/watermark.png",
        opacity = 0.5,
        position = "center"
    }
};

request.AddJsonBody(payload);

var response = await client.ExecuteAsync(request);

// Handle errors:
if (response.StatusCode >= System.Net.HttpStatusCode.BadRequest)
{
    throw new Exception($"Request failed with status code {response.StatusCode}");
}

File.WriteAllBytes("result.pdf", response.RawBytes);

Console.WriteLine("The PDF document was generated and saved to result.pdf");

This allows you to add visual protection to your documents with custom images.

For further details on the watermark property and its usage, please refer to our dedicated documentation.

We hope this guide was helpful. If you have any questions or noticed any issues on the code above,
feel free to drop us a line.