A watermark adds a visible text or image over an Excel spreadsheet without changing the data stored in its cells. This feature is useful when an XLS file needs a label such as a company or team name. Furthermore, watermarks can be textual markups similar to “Confidential,” “Draft,” or “Approved.” Watermark annotations can also help distinguish working copies from files ready for wider distribution. In this tutorial, you’ll learn how to add watermark annotations to XLS files in Java using the Cloud REST API. Annotating spreadsheets with watermarks helps teams and individual developers review Excel workbooks confidently and enhance collaboration.

Steps to Add Watermark Annotations to XLS in Java

1. Download the GroupDocs.Annotation Cloud SDK for Java and create a new project
2. Obtain your API credentials and set them up using the Configuration class
3. Initialize AnnotateApi and add the input XLS file with FileInfo
4. Configure the watermark annotation properties with AnnotationInfo
5. Apply annotation-related options such as the output file using AnnotateOptions
6. Request to add watermark annotation to XLS using the annotate() method

Adding a watermark annotation to an XLS gives readers immediate context about how to handle a file. For instance, a confidentiality watermark can draw attention to sensitive reports. Draft watermarks are useful when several versions of an XLS file are being circulated. Similarly, an ownership or branding mark can establish authenticity. With the Java REST API, watermark annotations can be included as part of a document workflow rather than added manually to every spreadsheet. It helps teams prepare invoices, financial sheets, project records, or internal reports in batches. You can also use the same approach when an existing Java application needs to add watermark annotations to Excel files before sharing or reviewing.

Code to Add Watermark Annotations to XLS in Java

In today’s article, we explored how GroupDocs.Annotation Cloud Java SDK enables developers to add watermark annotations to XLS files programmatically. It offers an automated solution to update XLS files while keeping the underlying workbook information available for normal use. Whether you are looking to identify confidential Excel documents, mark a sheet as a draft, or show ownership, a visible watermark can make the file’s status easier to understand. Your applications work seamlessly across Windows, Linux, and macOS. Using the Java REST API, you can annotate XLS files with watermarks as part of a repeatable document-processing workflow.

Work with different annotation types by referring to our tutorial on adding strikeout annotations to PDF documents using the Java REST API. This can be a useful next step when you need to mark important content in PDF files.