Nutrient

Team member
Nutrient
Pricing Documentation

Existing customer?

1 credit

PDF Watermark C# API

Nutrient DWS API is an HTTP API that lets you add watermarks to your documents. Use the C# PDF Watermark API to add text or image watermarks to PDFs via a single API call.

Why Nutrient DWS API?

SOC 2 Compliant

Build the workflows you need without worrying about security. We don’t store any document data, and our API endpoints are served through encrypted connections.

Easy Integration

Get up and running in hours, not weeks. Access well-documented APIs and code samples that make integrating with your existing workflows a snap.

Robust and Flexible

With access to more than 30 tools, you can process one document in multiple ways by using API credits. Generate PDF from HTML, convert Word, Excel, PowerPoint and image files to PDF, and more.

Simple and Transparent Pricing

Select a package that suits your needs according to the number of credits you wish to spend. Each API tool and action has a specific credit cost.

Try It Out

This example will watermark all the pages of your document with the supplied logo.

1

Use Your Free API Calls

Sign up and receive 100 credits for free, or log in to automatically add your API key to sample code. If you are not sure how credits are consumed read more in our pricing documentation , or check out this guide on calculating credit usage.

Add a File

Add a PDF named document.pdf and an image file named logo.png to your project folder. You can also use our sample PDF and our sample image. The file name is case sensitive. Make sure the file name matches the file name in the sample code.

Run the Code

Copy the code and run it from the same folder you added the files to. For more information, see our language-specific getting started guides.

View the Results

Open result.pdf in your project folder to view the results. 

curl -X POST https://api.nutrient.io/build \
  -H "Authorization: Bearer your_api_key_here" \
  -o result.pdf \
  --fail \
  -F [email protected] \
  -F [email protected] \
  -F instructions='{
      "parts": [
        {
          "file": "document"
        }
      ],
      "actions": [
        {
          "type": "watermark",
          "image": "logo",
          "width": "25%"
        }
      ]
    }'

curl -X POST https://api.nutrient.io/build ^
  -H "Authorization: Bearer your_api_key_here" ^
  -o result.pdf ^
  --fail ^
  -F [email protected] ^
  -F [email protected] ^
  -F instructions="{\"parts\": [{\"file\": \"document\"}], \"actions\": [{\"type\": \"watermark\", \"image\": \"logo\", \"width\": \"25%\"}]}"

package com.example.pspdfkit;

import java.io.File;
import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.StandardCopyOption;

import org.json.JSONArray;
import org.json.JSONObject;

import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public final class PspdfkitApiExample {
  public static void main(final String[] args) throws IOException {
    final RequestBody body = new MultipartBody.Builder()
      .setType(MultipartBody.FORM)
      .addFormDataPart(
        "document",
        "document.pdf",
        RequestBody.create(
          MediaType.parse("application/pdf"),
          new File("document.pdf")
        )
      )
      .addFormDataPart(
        "logo",
        "logo.png",
        RequestBody.create(
          MediaType.parse("image/png"),
          new File("logo.png")
        )
      )
      .addFormDataPart(
        "instructions",
        new JSONObject()
          .put("parts", new JSONArray()
            .put(new JSONObject()
              .put("file", "document")
            )
          )
          .put("actions", new JSONArray()
            .put(new JSONObject()
              .put("type", "watermark")
              .put("image", "logo")
              .put("width", "25%")
            )
          ).toString()
      )
      .build();

    final Request request = new Request.Builder()
      .url("https://api.nutrient.io/build")
      .method("POST", body)
      .addHeader("Authorization", "Bearer your_api_key_here")
      .build();

    final OkHttpClient client = new OkHttpClient()
      .newBuilder()
      .build();

    final Response response = client.newCall(request).execute();

    if (response.isSuccessful()) {
      Files.copy(
        response.body().byteStream(),
        FileSystems.getDefault().getPath("result.pdf"),
        StandardCopyOption.REPLACE_EXISTING
      );
    } else {
      // Handle the error
      throw new IOException(response.body().string());
    }
  }
}

using System;
using System.IO;
using System.Net;
using RestSharp;

namespace PspdfkitApiDemo
{
  class Program
  {
    static void Main(string[] args)
    {
      var client = new RestClient("https://api.nutrient.io/build");

      var request = new RestRequest(Method.POST)
        .AddHeader("Authorization", "Bearer your_api_key_here")
        .AddFile("document", "document.pdf")
        .AddFile("logo", "logo.png")
        .AddParameter("instructions", new JsonObject
        {
          ["parts"] = new JsonArray
          {
            new JsonObject
            {
              ["file"] = "document"
            }
          },
          ["actions"] = new JsonArray
          {
            new JsonObject
            {
              ["type"] = "watermark",
              ["image"] = "logo",
              ["width"] = "25%"
            }
          }
        }.ToString());

      request.AdvancedResponseWriter = (responseStream, response) =>
      {
        if (response.StatusCode == HttpStatusCode.OK)
        {
          using (responseStream)
          {
            using var outputFileWriter = File.OpenWrite("result.pdf");
            responseStream.CopyTo(outputFileWriter);
          }
        }
        else
        {
          var responseStreamReader = new StreamReader(responseStream);
          Console.Write(responseStreamReader.ReadToEnd());
        }
      };

      client.Execute(request);
    }
  }
}

// This code requires Node.js. Do not run this code directly in a web browser.

const axios = require('axios')
const FormData = require('form-data')
const fs = require('fs')

const formData = new FormData()
formData.append('instructions', JSON.stringify({
  parts: [
    {
      file: "document"
    }
  ],
  actions: [
    {
      type: "watermark",
      image: "logo",
      width: "25%"
    }
  ]
}))
formData.append('document', fs.createReadStream('document.pdf'))
formData.append('logo', fs.createReadStream('logo.png'))

;(async () => {
  try {
    const response = await axios.post('https://api.nutrient.io/build', formData, {
      headers: formData.getHeaders({
        'Authorization': 'Bearer your_api_key_here'
      }),
      responseType: "stream"
    })

    response.data.pipe(fs.createWriteStream("result.pdf"))
  } catch (e) {
    const errorString = await streamToString(e.response.data)
    console.log(errorString)
  }
})()

function streamToString(stream) {
  const chunks = []
  return new Promise((resolve, reject) => {
    stream.on("data", (chunk) => chunks.push(Buffer.from(chunk)))
    stream.on("error", (err) => reject(err))
    stream.on("end", () => resolve(Buffer.concat(chunks).toString("utf8")))
  })
}

import requests
import json

response = requests.request(
  'POST',
  'https://api.nutrient.io/build',
  headers = {
    'Authorization': 'Bearer your_api_key_here'
  },
  files = {
    'document': open('document.pdf', 'rb'),
    'logo': open('logo.png', 'rb')
  },
  data = {
    'instructions': json.dumps({
      'parts': [
        {
          'file': 'document'
        }
      ],
      'actions': [
        {
          'type': 'watermark',
          'image': 'logo',
          'width': '25%'
        }
      ]
    })
  },
  stream = True
)

if response.ok:
  with open('result.pdf', 'wb') as fd:
    for chunk in response.iter_content(chunk_size=8096):
      fd.write(chunk)
else:
  print(response.text)
  exit()

<?php

$FileHandle = fopen('result.pdf', 'w+');

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://api.nutrient.io/build',
  CURLOPT_CUSTOMREQUEST => 'POST',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_POSTFIELDS => array(
    'instructions' => '{
      "parts": [
        {
          "file": "document"
        }
      ],
      "actions": [
        {
          "type": "watermark",
          "image": "logo",
          "width": "25%"
        }
      ]
    }',
    'document' => new CURLFILE('document.pdf'),
    'logo' => new CURLFILE('logo.png')
  ),
  CURLOPT_HTTPHEADER => array(
    'Authorization: Bearer your_api_key_here'
  ),
  CURLOPT_FILE => $FileHandle,
));

$response = curl_exec($curl);

curl_close($curl);

fclose($FileHandle);


POST https://api.nutrient.io/build HTTP/1.1
Content-Type: multipart/form-data; boundary=--customboundary
Authorization: Bearer your_api_key_here

--customboundary
Content-Disposition: form-data; name="instructions"
Content-Type: application/json

{
  "parts": [
    {
      "file": "document"
    }
  ],
  "actions": [
    {
      "type": "watermark",
      "image": "logo",
      "width": "25%"
    }
  ]
}
--customboundary
Content-Disposition: form-data; name="document"; filename="document.pdf"
Content-Type: application/pdf

(document data)
--customboundary
Content-Disposition: form-data; name="logo"; filename="logo.png"
Content-Type: image/png

(logo data)
--customboundary--
Using Postman? Download our official collection and start using the API with a single click. Read more 

Your API Key

Examples

The following sections show more examples of how the watermark API can be used.

Multiple Watermarks

This example will add multiple watermarks to the document. The image watermark will be placed in the center of the screen, while the text will be positioned in the bottom left corner. The text watermark's opacity and font attributes can also be customized. 

curl -X POST https://api.nutrient.io/build \
  -H "Authorization: Bearer your_api_key_here" \
  -o result.pdf \
  --fail \
  -F [email protected] \
  -F [email protected] \
  -F instructions='{
      "parts": [
        {
          "file": "document"
        }
      ],
      "actions": [
        {
          "type": "watermark",
          "image": "logo",
          "width": "50%"
        },
        {
          "type": "watermark",
          "text": "Property of Nutrient",
          "width": 250,
          "height": 200,
          "left": 0,
          "bottom": "100%",
          "opacity": 0.5,
          "rotation": 10,
          "fontSize": 50,
          "fontColor": "#FF0000",
          "fontStyle": [
            "italic",
            "bold"
          ],
          "fontFamily": "Helvetica"
        }
      ]
    }'

curl -X POST https://api.nutrient.io/build ^
  -H "Authorization: Bearer your_api_key_here" ^
  -o result.pdf ^
  --fail ^
  -F [email protected] ^
  -F [email protected] ^
  -F instructions="{\"parts\": [{\"file\": \"document\"}], \"actions\": [{\"type\": \"watermark\", \"image\": \"logo\", \"width\": \"50%\"}, {\"type\": \"watermark\", \"text\": \"Property of Nutrient\", \"width\": 250, \"height\": 200, \"left\": 0, \"bottom\": \"100%\", \"opacity\": 0.5, \"rotation\": 10, \"fontSize\": 50, \"fontColor\": \"#FF0000\", \"fontStyle\": [\"italic\", \"bold\"], \"fontFamily\": \"Helvetica\"}]}"

package com.example.pspdfkit;

import java.io.File;
import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.StandardCopyOption;

import org.json.JSONArray;
import org.json.JSONObject;

import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public final class PspdfkitApiExample {
  public static void main(final String[] args) throws IOException {
    final RequestBody body = new MultipartBody.Builder()
      .setType(MultipartBody.FORM)
      .addFormDataPart(
        "document",
        "document.pdf",
        RequestBody.create(
          MediaType.parse("application/pdf"),
          new File("document.pdf")
        )
      )
      .addFormDataPart(
        "logo",
        "logo.png",
        RequestBody.create(
          MediaType.parse("image/png"),
          new File("logo.png")
        )
      )
      .addFormDataPart(
        "instructions",
        new JSONObject()
          .put("parts", new JSONArray()
            .put(new JSONObject()
              .put("file", "document")
            )
          )
          .put("actions", new JSONArray()
            .put(new JSONObject()
              .put("type", "watermark")
              .put("image", "logo")
              .put("width", "50%")
            )
            .put(new JSONObject()
              .put("type", "watermark")
              .put("text", "Property of Nutrient")
              .put("width", 250)
              .put("height", 200)
              .put("left", 0)
              .put("bottom", "100%")
              .put("opacity", 0.5)
              .put("rotation", 10)
              .put("fontSize", 50)
              .put("fontColor", "#FF0000")
              .put("fontStyle", new JSONArray()
                .put("italic")
                .put("bold")
              )
              .put("fontFamily", "Helvetica")
            )
          ).toString()
      )
      .build();

    final Request request = new Request.Builder()
      .url("https://api.nutrient.io/build")
      .method("POST", body)
      .addHeader("Authorization", "Bearer your_api_key_here")
      .build();

    final OkHttpClient client = new OkHttpClient()
      .newBuilder()
      .build();

    final Response response = client.newCall(request).execute();

    if (response.isSuccessful()) {
      Files.copy(
        response.body().byteStream(),
        FileSystems.getDefault().getPath("result.pdf"),
        StandardCopyOption.REPLACE_EXISTING
      );
    } else {
      // Handle the error
      throw new IOException(response.body().string());
    }
  }
}

using System;
using System.IO;
using System.Net;
using RestSharp;

namespace PspdfkitApiDemo
{
  class Program
  {
    static void Main(string[] args)
    {
      var client = new RestClient("https://api.nutrient.io/build");

      var request = new RestRequest(Method.POST)
        .AddHeader("Authorization", "Bearer your_api_key_here")
        .AddFile("document", "document.pdf")
        .AddFile("logo", "logo.png")
        .AddParameter("instructions", new JsonObject
        {
          ["parts"] = new JsonArray
          {
            new JsonObject
            {
              ["file"] = "document"
            }
          },
          ["actions"] = new JsonArray
          {
            new JsonObject
            {
              ["type"] = "watermark",
              ["image"] = "logo",
              ["width"] = "50%"
            },
            new JsonObject
            {
              ["type"] = "watermark",
              ["text"] = "Property of Nutrient",
              ["width"] = 250,
              ["height"] = 200,
              ["left"] = 0,
              ["bottom"] = "100%",
              ["opacity"] = 0.5,
              ["rotation"] = 10,
              ["fontSize"] = 50,
              ["fontColor"] = "#FF0000",
              ["fontStyle"] = new JsonArray
              {
                "italic",
                "bold"
              },
              ["fontFamily"] = "Helvetica"
            }
          }
        }.ToString());

      request.AdvancedResponseWriter = (responseStream, response) =>
      {
        if (response.StatusCode == HttpStatusCode.OK)
        {
          using (responseStream)
          {
            using var outputFileWriter = File.OpenWrite("result.pdf");
            responseStream.CopyTo(outputFileWriter);
          }
        }
        else
        {
          var responseStreamReader = new StreamReader(responseStream);
          Console.Write(responseStreamReader.ReadToEnd());
        }
      };

      client.Execute(request);
    }
  }
}

// This code requires Node.js. Do not run this code directly in a web browser.

const axios = require('axios')
const FormData = require('form-data')
const fs = require('fs')

const formData = new FormData()
formData.append('instructions', JSON.stringify({
  parts: [
    {
      file: "document"
    }
  ],
  actions: [
    {
      type: "watermark",
      image: "logo",
      width: "50%"
    },
    {
      type: "watermark",
      text: "Property of Nutrient",
      width: 250,
      height: 200,
      left: 0,
      bottom: "100%",
      opacity: 0.5,
      rotation: 10,
      fontSize: 50,
      fontColor: "#FF0000",
      fontStyle: [
        "italic",
        "bold"
      ],
      fontFamily: "Helvetica"
    }
  ]
}))
formData.append('document', fs.createReadStream('document.pdf'))
formData.append('logo', fs.createReadStream('logo.png'))

;(async () => {
  try {
    const response = await axios.post('https://api.nutrient.io/build', formData, {
      headers: formData.getHeaders({
        'Authorization': 'Bearer your_api_key_here'
      }),
      responseType: "stream"
    })

    response.data.pipe(fs.createWriteStream("result.pdf"))
  } catch (e) {
    const errorString = await streamToString(e.response.data)
    console.log(errorString)
  }
})()

function streamToString(stream) {
  const chunks = []
  return new Promise((resolve, reject) => {
    stream.on("data", (chunk) => chunks.push(Buffer.from(chunk)))
    stream.on("error", (err) => reject(err))
    stream.on("end", () => resolve(Buffer.concat(chunks).toString("utf8")))
  })
}

import requests
import json

response = requests.request(
  'POST',
  'https://api.nutrient.io/build',
  headers = {
    'Authorization': 'Bearer your_api_key_here'
  },
  files = {
    'document': open('document.pdf', 'rb'),
    'logo': open('logo.png', 'rb')
  },
  data = {
    'instructions': json.dumps({
      'parts': [
        {
          'file': 'document'
        }
      ],
      'actions': [
        {
          'type': 'watermark',
          'image': 'logo',
          'width': '50%'
        },
        {
          'type': 'watermark',
          'text': 'Property of Nutrient',
          'width': 250,
          'height': 200,
          'left': 0,
          'bottom': '100%',
          'opacity': 0.5,
          'rotation': 10,
          'fontSize': 50,
          'fontColor': '#FF0000',
          'fontStyle': [
            'italic',
            'bold'
          ],
          'fontFamily': 'Helvetica'
        }
      ]
    })
  },
  stream = True
)

if response.ok:
  with open('result.pdf', 'wb') as fd:
    for chunk in response.iter_content(chunk_size=8096):
      fd.write(chunk)
else:
  print(response.text)
  exit()

<?php

$FileHandle = fopen('result.pdf', 'w+');

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://api.nutrient.io/build',
  CURLOPT_CUSTOMREQUEST => 'POST',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_POSTFIELDS => array(
    'instructions' => '{
      "parts": [
        {
          "file": "document"
        }
      ],
      "actions": [
        {
          "type": "watermark",
          "image": "logo",
          "width": "50%"
        },
        {
          "type": "watermark",
          "text": "Property of Nutrient",
          "width": 250,
          "height": 200,
          "left": 0,
          "bottom": "100%",
          "opacity": 0.5,
          "rotation": 10,
          "fontSize": 50,
          "fontColor": "#FF0000",
          "fontStyle": [
            "italic",
            "bold"
          ],
          "fontFamily": "Helvetica"
        }
      ]
    }',
    'document' => new CURLFILE('document.pdf'),
    'logo' => new CURLFILE('logo.png')
  ),
  CURLOPT_HTTPHEADER => array(
    'Authorization: Bearer your_api_key_here'
  ),
  CURLOPT_FILE => $FileHandle,
));

$response = curl_exec($curl);

curl_close($curl);

fclose($FileHandle);


POST https://api.nutrient.io/build HTTP/1.1
Content-Type: multipart/form-data; boundary=--customboundary
Authorization: Bearer your_api_key_here

--customboundary
Content-Disposition: form-data; name="instructions"
Content-Type: application/json

{
  "parts": [
    {
      "file": "document"
    }
  ],
  "actions": [
    {
      "type": "watermark",
      "image": "logo",
      "width": "50%"
    },
    {
      "type": "watermark",
      "text": "Property of Nutrient",
      "width": 250,
      "height": 200,
      "left": 0,
      "bottom": "100%",
      "opacity": 0.5,
      "rotation": 10,
      "fontSize": 50,
      "fontColor": "#FF0000",
      "fontStyle": [
        "italic",
        "bold"
      ],
      "fontFamily": "Helvetica"
    }
  ]
}
--customboundary
Content-Disposition: form-data; name="document"; filename="document.pdf"
Content-Type: application/pdf

(document data)
--customboundary
Content-Disposition: form-data; name="logo"; filename="logo.png"
Content-Type: image/png

(logo data)
--customboundary--

Single-Page Watermark

This example will watermark the last page of the document. To do so, declare a part consisting of all pages of the source document but the last one, and a part with the last page and an image watermark action. 

curl -X POST https://api.nutrient.io/build \
  -H "Authorization: Bearer your_api_key_here" \
  -o result.pdf \
  --fail \
  -F [email protected] \
  -F [email protected] \
  -F instructions='{
      "parts": [
        {
          "file": "document",
          "pages": {
            "end": -2
          }
        },
        {
          "file": "document",
          "pages": {
            "start": -1
          },
          "actions": [
            {
              "type": "watermark",
              "image": "logo",
              "width": "50%"
            }
          ]
        }
      ]
    }'

curl -X POST https://api.nutrient.io/build ^
  -H "Authorization: Bearer your_api_key_here" ^
  -o result.pdf ^
  --fail ^
  -F [email protected] ^
  -F [email protected] ^
  -F instructions="{\"parts\": [{\"file\": \"document\", \"pages\": {\"end\": -2}}, {\"file\": \"document\", \"pages\": {\"start\": -1}, \"actions\": [{\"type\": \"watermark\", \"image\": \"logo\", \"width\": \"50%\"}]}]}"

package com.example.pspdfkit;

import java.io.File;
import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.StandardCopyOption;

import org.json.JSONArray;
import org.json.JSONObject;

import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public final class PspdfkitApiExample {
  public static void main(final String[] args) throws IOException {
    final RequestBody body = new MultipartBody.Builder()
      .setType(MultipartBody.FORM)
      .addFormDataPart(
        "document",
        "document.pdf",
        RequestBody.create(
          MediaType.parse("application/pdf"),
          new File("document.pdf")
        )
      )
      .addFormDataPart(
        "logo",
        "logo.png",
        RequestBody.create(
          MediaType.parse("image/png"),
          new File("logo.png")
        )
      )
      .addFormDataPart(
        "instructions",
        new JSONObject()
          .put("parts", new JSONArray()
            .put(new JSONObject()
              .put("file", "document")
              .put("pages", new JSONObject()
                .put("end", -2)
              )
            )
            .put(new JSONObject()
              .put("file", "document")
              .put("pages", new JSONObject()
                .put("start", -1)
              )
              .put("actions", new JSONArray()
                .put(new JSONObject()
                  .put("type", "watermark")
                  .put("image", "logo")
                  .put("width", "50%")
                )
              )
            )
          ).toString()
      )
      .build();

    final Request request = new Request.Builder()
      .url("https://api.nutrient.io/build")
      .method("POST", body)
      .addHeader("Authorization", "Bearer your_api_key_here")
      .build();

    final OkHttpClient client = new OkHttpClient()
      .newBuilder()
      .build();

    final Response response = client.newCall(request).execute();

    if (response.isSuccessful()) {
      Files.copy(
        response.body().byteStream(),
        FileSystems.getDefault().getPath("result.pdf"),
        StandardCopyOption.REPLACE_EXISTING
      );
    } else {
      // Handle the error
      throw new IOException(response.body().string());
    }
  }
}

using System;
using System.IO;
using System.Net;
using RestSharp;

namespace PspdfkitApiDemo
{
  class Program
  {
    static void Main(string[] args)
    {
      var client = new RestClient("https://api.nutrient.io/build");

      var request = new RestRequest(Method.POST)
        .AddHeader("Authorization", "Bearer your_api_key_here")
        .AddFile("document", "document.pdf")
        .AddFile("logo", "logo.png")
        .AddParameter("instructions", new JsonObject
        {
          ["parts"] = new JsonArray
          {
            new JsonObject
            {
              ["file"] = "document",
              ["pages"] = new JsonObject
              {
                ["end"] = -2
              }
            },
            new JsonObject
            {
              ["file"] = "document",
              ["pages"] = new JsonObject
              {
                ["start"] = -1
              },
              ["actions"] = new JsonArray
              {
                new JsonObject
                {
                  ["type"] = "watermark",
                  ["image"] = "logo",
                  ["width"] = "50%"
                }
              }
            }
          }
        }.ToString());

      request.AdvancedResponseWriter = (responseStream, response) =>
      {
        if (response.StatusCode == HttpStatusCode.OK)
        {
          using (responseStream)
          {
            using var outputFileWriter = File.OpenWrite("result.pdf");
            responseStream.CopyTo(outputFileWriter);
          }
        }
        else
        {
          var responseStreamReader = new StreamReader(responseStream);
          Console.Write(responseStreamReader.ReadToEnd());
        }
      };

      client.Execute(request);
    }
  }
}

// This code requires Node.js. Do not run this code directly in a web browser.

const axios = require('axios')
const FormData = require('form-data')
const fs = require('fs')

const formData = new FormData()
formData.append('instructions', JSON.stringify({
  parts: [
    {
      file: "document",
      pages: {
        end: -2
      }
    },
    {
      file: "document",
      pages: {
        start: -1
      },
      actions: [
        {
          type: "watermark",
          image: "logo",
          width: "50%"
        }
      ]
    }
  ]
}))
formData.append('document', fs.createReadStream('document.pdf'))
formData.append('logo', fs.createReadStream('logo.png'))

;(async () => {
  try {
    const response = await axios.post('https://api.nutrient.io/build', formData, {
      headers: formData.getHeaders({
        'Authorization': 'Bearer your_api_key_here'
      }),
      responseType: "stream"
    })

    response.data.pipe(fs.createWriteStream("result.pdf"))
  } catch (e) {
    const errorString = await streamToString(e.response.data)
    console.log(errorString)
  }
})()

function streamToString(stream) {
  const chunks = []
  return new Promise((resolve, reject) => {
    stream.on("data", (chunk) => chunks.push(Buffer.from(chunk)))
    stream.on("error", (err) => reject(err))
    stream.on("end", () => resolve(Buffer.concat(chunks).toString("utf8")))
  })
}

import requests
import json

response = requests.request(
  'POST',
  'https://api.nutrient.io/build',
  headers = {
    'Authorization': 'Bearer your_api_key_here'
  },
  files = {
    'document': open('document.pdf', 'rb'),
    'logo': open('logo.png', 'rb')
  },
  data = {
    'instructions': json.dumps({
      'parts': [
        {
          'file': 'document',
          'pages': {
            'end': -2
          }
        },
        {
          'file': 'document',
          'pages': {
            'start': -1
          },
          'actions': [
            {
              'type': 'watermark',
              'image': 'logo',
              'width': '50%'
            }
          ]
        }
      ]
    })
  },
  stream = True
)

if response.ok:
  with open('result.pdf', 'wb') as fd:
    for chunk in response.iter_content(chunk_size=8096):
      fd.write(chunk)
else:
  print(response.text)
  exit()

<?php

$FileHandle = fopen('result.pdf', 'w+');

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://api.nutrient.io/build',
  CURLOPT_CUSTOMREQUEST => 'POST',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_POSTFIELDS => array(
    'instructions' => '{
      "parts": [
        {
          "file": "document",
          "pages": {
            "end": -2
          }
        },
        {
          "file": "document",
          "pages": {
            "start": -1
          },
          "actions": [
            {
              "type": "watermark",
              "image": "logo",
              "width": "50%"
            }
          ]
        }
      ]
    }',
    'document' => new CURLFILE('document.pdf'),
    'logo' => new CURLFILE('logo.png')
  ),
  CURLOPT_HTTPHEADER => array(
    'Authorization: Bearer your_api_key_here'
  ),
  CURLOPT_FILE => $FileHandle,
));

$response = curl_exec($curl);

curl_close($curl);

fclose($FileHandle);


POST https://api.nutrient.io/build HTTP/1.1
Content-Type: multipart/form-data; boundary=--customboundary
Authorization: Bearer your_api_key_here

--customboundary
Content-Disposition: form-data; name="instructions"
Content-Type: application/json

{
  "parts": [
    {
      "file": "document",
      "pages": {
        "end": -2
      }
    },
    {
      "file": "document",
      "pages": {
        "start": -1
      },
      "actions": [
        {
          "type": "watermark",
          "image": "logo",
          "width": "50%"
        }
      ]
    }
  ]
}
--customboundary
Content-Disposition: form-data; name="document"; filename="document.pdf"
Content-Type: application/pdf

(document data)
--customboundary
Content-Disposition: form-data; name="logo"; filename="logo.png"
Content-Type: image/png

(logo data)
--customboundary--

Aligning Watermarks

This example will show some common watermark alignments by adding a text watermark in each of the corners. 

curl -X POST https://api.nutrient.io/build \
  -H "Authorization: Bearer your_api_key_here" \
  -o result.pdf \
  --fail \
  -F [email protected] \
  -F instructions='{
      "parts": [
        {
          "file": "document"
        }
      ],
      "actions": [
        {
          "type": "watermark",
          "text": "Top Left",
          "width": 150,
          "height": 20,
          "left": 0,
          "top": 0
        },
        {
          "type": "watermark",
          "text": "Top Center",
          "width": 150,
          "height": 20,
          "top": 0
        },
        {
          "type": "watermark",
          "text": "Top Right",
          "width": 150,
          "height": 20,
          "right": "100%",
          "top": 0
        },
        {
          "type": "watermark",
          "text": "Center Left",
          "width": 150,
          "height": 20,
          "left": 0
        },
        {
          "type": "watermark",
          "text": "Center",
          "width": 150,
          "height": 20
        },
        {
          "type": "watermark",
          "text": "Center Right",
          "width": 150,
          "height": 20,
          "right": "100%"
        },
        {
          "type": "watermark",
          "text": "Bottom Left",
          "width": 150,
          "height": 20,
          "left": 0,
          "bottom": "100%"
        },
        {
          "type": "watermark",
          "text": "Bottom Center",
          "width": 150,
          "height": 20,
          "bottom": "100%"
        },
        {
          "type": "watermark",
          "text": "Bottom Right",
          "width": 150,
          "height": 20,
          "right": "100%",
          "bottom": "100%"
        }
      ]
    }'

curl -X POST https://api.nutrient.io/build ^
  -H "Authorization: Bearer your_api_key_here" ^
  -o result.pdf ^
  --fail ^
  -F [email protected] ^
  -F instructions="{\"parts\": [{\"file\": \"document\"}], \"actions\": [{\"type\": \"watermark\", \"text\": \"Top Left\", \"width\": 150, \"height\": 20, \"left\": 0, \"top\": 0}, {\"type\": \"watermark\", \"text\": \"Top Center\", \"width\": 150, \"height\": 20, \"top\": 0}, {\"type\": \"watermark\", \"text\": \"Top Right\", \"width\": 150, \"height\": 20, \"right\": \"100%\", \"top\": 0}, {\"type\": \"watermark\", \"text\": \"Center Left\", \"width\": 150, \"height\": 20, \"left\": 0}, {\"type\": \"watermark\", \"text\": \"Center\", \"width\": 150, \"height\": 20}, {\"type\": \"watermark\", \"text\": \"Center Right\", \"width\": 150, \"height\": 20, \"right\": \"100%\"}, {\"type\": \"watermark\", \"text\": \"Bottom Left\", \"width\": 150, \"height\": 20, \"left\": 0, \"bottom\": \"100%\"}, {\"type\": \"watermark\", \"text\": \"Bottom Center\", \"width\": 150, \"height\": 20, \"bottom\": \"100%\"}, {\"type\": \"watermark\", \"text\": \"Bottom Right\", \"width\": 150, \"height\": 20, \"right\": \"100%\", \"bottom\": \"100%\"}]}"

package com.example.pspdfkit;

import java.io.File;
import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.StandardCopyOption;

import org.json.JSONArray;
import org.json.JSONObject;

import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public final class PspdfkitApiExample {
  public static void main(final String[] args) throws IOException {
    final RequestBody body = new MultipartBody.Builder()
      .setType(MultipartBody.FORM)
      .addFormDataPart(
        "document",
        "document.pdf",
        RequestBody.create(
          MediaType.parse("application/pdf"),
          new File("document.pdf")
        )
      )
      .addFormDataPart(
        "instructions",
        new JSONObject()
          .put("parts", new JSONArray()
            .put(new JSONObject()
              .put("file", "document")
            )
          )
          .put("actions", new JSONArray()
            .put(new JSONObject()
              .put("type", "watermark")
              .put("text", "Top Left")
              .put("width", 150)
              .put("height", 20)
              .put("left", 0)
              .put("top", 0)
            )
            .put(new JSONObject()
              .put("type", "watermark")
              .put("text", "Top Center")
              .put("width", 150)
              .put("height", 20)
              .put("top", 0)
            )
            .put(new JSONObject()
              .put("type", "watermark")
              .put("text", "Top Right")
              .put("width", 150)
              .put("height", 20)
              .put("right", "100%")
              .put("top", 0)
            )
            .put(new JSONObject()
              .put("type", "watermark")
              .put("text", "Center Left")
              .put("width", 150)
              .put("height", 20)
              .put("left", 0)
            )
            .put(new JSONObject()
              .put("type", "watermark")
              .put("text", "Center")
              .put("width", 150)
              .put("height", 20)
            )
            .put(new JSONObject()
              .put("type", "watermark")
              .put("text", "Center Right")
              .put("width", 150)
              .put("height", 20)
              .put("right", "100%")
            )
            .put(new JSONObject()
              .put("type", "watermark")
              .put("text", "Bottom Left")
              .put("width", 150)
              .put("height", 20)
              .put("left", 0)
              .put("bottom", "100%")
            )
            .put(new JSONObject()
              .put("type", "watermark")
              .put("text", "Bottom Center")
              .put("width", 150)
              .put("height", 20)
              .put("bottom", "100%")
            )
            .put(new JSONObject()
              .put("type", "watermark")
              .put("text", "Bottom Right")
              .put("width", 150)
              .put("height", 20)
              .put("right", "100%")
              .put("bottom", "100%")
            )
          ).toString()
      )
      .build();

    final Request request = new Request.Builder()
      .url("https://api.nutrient.io/build")
      .method("POST", body)
      .addHeader("Authorization", "Bearer your_api_key_here")
      .build();

    final OkHttpClient client = new OkHttpClient()
      .newBuilder()
      .build();

    final Response response = client.newCall(request).execute();

    if (response.isSuccessful()) {
      Files.copy(
        response.body().byteStream(),
        FileSystems.getDefault().getPath("result.pdf"),
        StandardCopyOption.REPLACE_EXISTING
      );
    } else {
      // Handle the error
      throw new IOException(response.body().string());
    }
  }
}

using System;
using System.IO;
using System.Net;
using RestSharp;

namespace PspdfkitApiDemo
{
  class Program
  {
    static void Main(string[] args)
    {
      var client = new RestClient("https://api.nutrient.io/build");

      var request = new RestRequest(Method.POST)
        .AddHeader("Authorization", "Bearer your_api_key_here")
        .AddFile("document", "document.pdf")
        .AddParameter("instructions", new JsonObject
        {
          ["parts"] = new JsonArray
          {
            new JsonObject
            {
              ["file"] = "document"
            }
          },
          ["actions"] = new JsonArray
          {
            new JsonObject
            {
              ["type"] = "watermark",
              ["text"] = "Top Left",
              ["width"] = 150,
              ["height"] = 20,
              ["left"] = 0,
              ["top"] = 0
            },
            new JsonObject
            {
              ["type"] = "watermark",
              ["text"] = "Top Center",
              ["width"] = 150,
              ["height"] = 20,
              ["top"] = 0
            },
            new JsonObject
            {
              ["type"] = "watermark",
              ["text"] = "Top Right",
              ["width"] = 150,
              ["height"] = 20,
              ["right"] = "100%",
              ["top"] = 0
            },
            new JsonObject
            {
              ["type"] = "watermark",
              ["text"] = "Center Left",
              ["width"] = 150,
              ["height"] = 20,
              ["left"] = 0
            },
            new JsonObject
            {
              ["type"] = "watermark",
              ["text"] = "Center",
              ["width"] = 150,
              ["height"] = 20
            },
            new JsonObject
            {
              ["type"] = "watermark",
              ["text"] = "Center Right",
              ["width"] = 150,
              ["height"] = 20,
              ["right"] = "100%"
            },
            new JsonObject
            {
              ["type"] = "watermark",
              ["text"] = "Bottom Left",
              ["width"] = 150,
              ["height"] = 20,
              ["left"] = 0,
              ["bottom"] = "100%"
            },
            new JsonObject
            {
              ["type"] = "watermark",
              ["text"] = "Bottom Center",
              ["width"] = 150,
              ["height"] = 20,
              ["bottom"] = "100%"
            },
            new JsonObject
            {
              ["type"] = "watermark",
              ["text"] = "Bottom Right",
              ["width"] = 150,
              ["height"] = 20,
              ["right"] = "100%",
              ["bottom"] = "100%"
            }
          }
        }.ToString());

      request.AdvancedResponseWriter = (responseStream, response) =>
      {
        if (response.StatusCode == HttpStatusCode.OK)
        {
          using (responseStream)
          {
            using var outputFileWriter = File.OpenWrite("result.pdf");
            responseStream.CopyTo(outputFileWriter);
          }
        }
        else
        {
          var responseStreamReader = new StreamReader(responseStream);
          Console.Write(responseStreamReader.ReadToEnd());
        }
      };

      client.Execute(request);
    }
  }
}

// This code requires Node.js. Do not run this code directly in a web browser.

const axios = require('axios')
const FormData = require('form-data')
const fs = require('fs')

const formData = new FormData()
formData.append('instructions', JSON.stringify({
  parts: [
    {
      file: "document"
    }
  ],
  actions: [
    {
      type: "watermark",
      text: "Top Left",
      width: 150,
      height: 20,
      left: 0,
      top: 0
    },
    {
      type: "watermark",
      text: "Top Center",
      width: 150,
      height: 20,
      top: 0
    },
    {
      type: "watermark",
      text: "Top Right",
      width: 150,
      height: 20,
      right: "100%",
      top: 0
    },
    {
      type: "watermark",
      text: "Center Left",
      width: 150,
      height: 20,
      left: 0
    },
    {
      type: "watermark",
      text: "Center",
      width: 150,
      height: 20
    },
    {
      type: "watermark",
      text: "Center Right",
      width: 150,
      height: 20,
      right: "100%"
    },
    {
      type: "watermark",
      text: "Bottom Left",
      width: 150,
      height: 20,
      left: 0,
      bottom: "100%"
    },
    {
      type: "watermark",
      text: "Bottom Center",
      width: 150,
      height: 20,
      bottom: "100%"
    },
    {
      type: "watermark",
      text: "Bottom Right",
      width: 150,
      height: 20,
      right: "100%",
      bottom: "100%"
    }
  ]
}))
formData.append('document', fs.createReadStream('document.pdf'))

;(async () => {
  try {
    const response = await axios.post('https://api.nutrient.io/build', formData, {
      headers: formData.getHeaders({
        'Authorization': 'Bearer your_api_key_here'
      }),
      responseType: "stream"
    })

    response.data.pipe(fs.createWriteStream("result.pdf"))
  } catch (e) {
    const errorString = await streamToString(e.response.data)
    console.log(errorString)
  }
})()

function streamToString(stream) {
  const chunks = []
  return new Promise((resolve, reject) => {
    stream.on("data", (chunk) => chunks.push(Buffer.from(chunk)))
    stream.on("error", (err) => reject(err))
    stream.on("end", () => resolve(Buffer.concat(chunks).toString("utf8")))
  })
}

import requests
import json

response = requests.request(
  'POST',
  'https://api.nutrient.io/build',
  headers = {
    'Authorization': 'Bearer your_api_key_here'
  },
  files = {
    'document': open('document.pdf', 'rb')
  },
  data = {
    'instructions': json.dumps({
      'parts': [
        {
          'file': 'document'
        }
      ],
      'actions': [
        {
          'type': 'watermark',
          'text': 'Top Left',
          'width': 150,
          'height': 20,
          'left': 0,
          'top': 0
        },
        {
          'type': 'watermark',
          'text': 'Top Center',
          'width': 150,
          'height': 20,
          'top': 0
        },
        {
          'type': 'watermark',
          'text': 'Top Right',
          'width': 150,
          'height': 20,
          'right': '100%',
          'top': 0
        },
        {
          'type': 'watermark',
          'text': 'Center Left',
          'width': 150,
          'height': 20,
          'left': 0
        },
        {
          'type': 'watermark',
          'text': 'Center',
          'width': 150,
          'height': 20
        },
        {
          'type': 'watermark',
          'text': 'Center Right',
          'width': 150,
          'height': 20,
          'right': '100%'
        },
        {
          'type': 'watermark',
          'text': 'Bottom Left',
          'width': 150,
          'height': 20,
          'left': 0,
          'bottom': '100%'
        },
        {
          'type': 'watermark',
          'text': 'Bottom Center',
          'width': 150,
          'height': 20,
          'bottom': '100%'
        },
        {
          'type': 'watermark',
          'text': 'Bottom Right',
          'width': 150,
          'height': 20,
          'right': '100%',
          'bottom': '100%'
        }
      ]
    })
  },
  stream = True
)

if response.ok:
  with open('result.pdf', 'wb') as fd:
    for chunk in response.iter_content(chunk_size=8096):
      fd.write(chunk)
else:
  print(response.text)
  exit()

<?php

$FileHandle = fopen('result.pdf', 'w+');

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://api.nutrient.io/build',
  CURLOPT_CUSTOMREQUEST => 'POST',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_POSTFIELDS => array(
    'instructions' => '{
      "parts": [
        {
          "file": "document"
        }
      ],
      "actions": [
        {
          "type": "watermark",
          "text": "Top Left",
          "width": 150,
          "height": 20,
          "left": 0,
          "top": 0
        },
        {
          "type": "watermark",
          "text": "Top Center",
          "width": 150,
          "height": 20,
          "top": 0
        },
        {
          "type": "watermark",
          "text": "Top Right",
          "width": 150,
          "height": 20,
          "right": "100%",
          "top": 0
        },
        {
          "type": "watermark",
          "text": "Center Left",
          "width": 150,
          "height": 20,
          "left": 0
        },
        {
          "type": "watermark",
          "text": "Center",
          "width": 150,
          "height": 20
        },
        {
          "type": "watermark",
          "text": "Center Right",
          "width": 150,
          "height": 20,
          "right": "100%"
        },
        {
          "type": "watermark",
          "text": "Bottom Left",
          "width": 150,
          "height": 20,
          "left": 0,
          "bottom": "100%"
        },
        {
          "type": "watermark",
          "text": "Bottom Center",
          "width": 150,
          "height": 20,
          "bottom": "100%"
        },
        {
          "type": "watermark",
          "text": "Bottom Right",
          "width": 150,
          "height": 20,
          "right": "100%",
          "bottom": "100%"
        }
      ]
    }',
    'document' => new CURLFILE('document.pdf')
  ),
  CURLOPT_HTTPHEADER => array(
    'Authorization: Bearer your_api_key_here'
  ),
  CURLOPT_FILE => $FileHandle,
));

$response = curl_exec($curl);

curl_close($curl);

fclose($FileHandle);


POST https://api.nutrient.io/build HTTP/1.1
Content-Type: multipart/form-data; boundary=--customboundary
Authorization: Bearer your_api_key_here

--customboundary
Content-Disposition: form-data; name="instructions"
Content-Type: application/json

{
  "parts": [
    {
      "file": "document"
    }
  ],
  "actions": [
    {
      "type": "watermark",
      "text": "Top Left",
      "width": 150,
      "height": 20,
      "left": 0,
      "top": 0
    },
    {
      "type": "watermark",
      "text": "Top Center",
      "width": 150,
      "height": 20,
      "top": 0
    },
    {
      "type": "watermark",
      "text": "Top Right",
      "width": 150,
      "height": 20,
      "right": "100%",
      "top": 0
    },
    {
      "type": "watermark",
      "text": "Center Left",
      "width": 150,
      "height": 20,
      "left": 0
    },
    {
      "type": "watermark",
      "text": "Center",
      "width": 150,
      "height": 20
    },
    {
      "type": "watermark",
      "text": "Center Right",
      "width": 150,
      "height": 20,
      "right": "100%"
    },
    {
      "type": "watermark",
      "text": "Bottom Left",
      "width": 150,
      "height": 20,
      "left": 0,
      "bottom": "100%"
    },
    {
      "type": "watermark",
      "text": "Bottom Center",
      "width": 150,
      "height": 20,
      "bottom": "100%"
    },
    {
      "type": "watermark",
      "text": "Bottom Right",
      "width": 150,
      "height": 20,
      "right": "100%",
      "bottom": "100%"
    }
  ]
}
--customboundary
Content-Disposition: form-data; name="document"; filename="document.pdf"
Content-Type: application/pdf

(document data)
--customboundary--

Reference

The following schema shows all the options and valid inputs for the watermark action.

Typescript 
// The size of the watermark can either be a positive integer or a percentage (e.g. representing a ratio of the page dimension).
type Dimension = number | string;

// The position of the watermark can either be a non-negative integer or a percentage (e.g. representing a ratio of the page dimension).
type Position = number | string;

// Represents one part that was sent in the multipart request. Should be the
// `name` that was specified for the part.
type MultipartReference = string;

type WatermarkAction = {
  type: "watermark",

  // Only either "text" or "image" can be specified.
  text?: string, // When specified, this is the text that the watermark will contain.
  image?: MultipartReference, // When specified, this is the image that will be used as the watermark.

  // For images, one dimension needs to be specified. For text watermarks, both dimensions need to be specified.
  width?: Dimension,
  height?: Dimension,

  // The position defaults to the center of the page.
  // You can only specify one position per axis, so either:
  // top or bottom
  // and either
  // left or right.
  top?: Position,
  right?: Position,
  bottom?: Position,
  left?: Position,

  // The value of opacity should be between 0 and 1.
  opacity?: float,

  // Angle of rotation in degrees. Should be between 0 and 360.
  rotation?: integer,

  // Font and styling (Only valid for text watermarks)
  fontSize?: integer,
  fontColor?: string, // Font color as hex code. Example: "#FF0000".
  fontStyle?: string[], // Either ["italic", "bold"], or any one of them.
  fontFamily?: string, // String describing the font family.
};