Add Image Watermarks


This REST API allows adding image watermarks to the document.

With this API you can add image watermarks with the following features:

  • Image watermark supports various image formats: PNG, GIF, TIFF, JPG.
  • You may upload the desired image to the Storage and then pass the path as a parameter of Watermark operation;
  • There are many watermark positioning and transforming properties;
  • There are format-specific options. These options allow to leverage specific format features and often allow to make watermarks stronger;
  • For protected documents, it is required to provide the password.

The following example demonstrates how to add watermark to the document.┬áHere you can see how to create a watermark from the image file, protect the document and it’s inner images.

cURL Example

# First get JSON Web Token
# Please get your Client Id and Client Secret from
# Kindly place Client Id in "client_id" and Client Secret in "client_secret" argument.
curl -v "" \
-d "grant_type#client_credentials&client_id#xxxx&client_secret#xxxx" \
-H "Content-Type: application/x-www-form-urlencoded" \
-H "Accept: application/json"
# cURL example to join several documents into one
curl -v "" \
-H "Content-Type: application/json" \
-H "Accept: application/json" \
-H "Authorization: Bearer <jwt token>" \
-d "{
    "FileInfo": {
        "FilePath": "documents\\sample.pdf",
        "StorageName": ""
    "WatermarkDetails": [
            "ImageWatermarkOptions": {
                "Image": {
                    "FilePath": "watermark_images\\sample_watermark.png",
                    "StorageName": ""
    "ProtectLevel": 2
    "downloadUrl": "",
    "path": "watermark/added_watermark/documents/sample_pdf/sample.pdf"


Our API is completely independent of your operating system, database system or development language. You can use any language and platform that supports HTTP to interact with our API. However, manually writing client code can be difficult, error-prone and time-consuming. Therefore, we have provided and support API SDKs in many development languages in order to make it easier to integrate with us. If you use SDK, it adds the Watermark API calls and lets you use GroupDocs Cloud features in a native way for your preferred language.

SDK Examples