In this tutorial you’ll discover how to Java PDF add a watermark to a document using the Aspose.PDF Cloud REST API, with a quick look at customizing the watermark’s appearance and placement on specific pages. For more details on the PDF format, see the PDF file information page.
Prerequisite
- Create an account API credentials
- Download the Aspose.PDF Cloud SDK for Java
- Set up a Java project with the above SDK for working with text stamps
Steps to Add Watermark to PDF Document with Java RESTful Service
- Configure the PdfApi class object with API key and App SID.
- Create a Stamp object and set its parameters.
- Upload the target PDF file to the cloud storage for adding a watermark.
- Call the PutPageAddStamp() method to insert the Stamp as a watermark.
- Download the PDF file with a watermark on it.
These steps describe how to add a watermark in PDF online with the Java REST interface. Instantiate the PdfApi object, create a stamp object, set its properties, upload the PDF file to the cloud, call PutPageAddStamp() to add the stamp text as a watermark, and finally save the output PDF file with the watermark to disk.
Code to Put Watermark on PDF with Java REST Interface
The sample demonstrates how to put a watermark on a PDF using the Java‑based API. You can configure various parameters for the watermark stamp such as text value, stamp type, background flag, indentation, rotation, opacity, zoom level, foreground color, and margins. The SDK also supports reading and deleting watermarks and other stamps on a PDF file.
If you want to insert an image into a PDF file, follow the article Insert Image into PDF with Java REST API.
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