XLS spreadsheets are used to save financial records, project data, and other information that needs to be shared with colleagues or clients. When these files move between departments or go through several rounds of review, it helps to make their status clear. Watermark annotations provide a straightforward method to label XLS workbooks without changing the underlying data. In this guide, you’ll learn how to add watermark annotations to XLS files using Python and a REST API. It makes spreadsheet labelling easier for business users and professionals who regularly share Excel documents.

Why Add Watermark Annotations to XLS Files?

A visible watermark helps distinguish draft spreadsheets from approved reports. You can use it to mark sensitive financial data as confidential. It helps recipients understand how to handle the file, especially when multiple versions are being shared. This simple addition makes spreadsheet reviews more convenient.

Steps to Add Watermark Annotations to XLS Files in Python

1. Import and set up GroupDocs.Annotation Cloud SDK for Python
2. Initialize the AnnotateApi with your API credentials
3. Load the source XLS file using FileInfo
4. Create a watermark annotation and configure it using AnnotationInfo
5. Apply annotation options, including the output file path, using AnnotateOptions
6. Send a request to annotate XLS and execute it using the annotate() method

Following these steps, you can apply watermarks to spreadsheet files without installing desktop annotation software. Watermark annotations let developers identify XLS files throughout everyday business workflows. Programmatically adding watermarks can also reduce repetitive manual tasks when multiple spreadsheets need the same treatment. The Python REST API supports integration into different working environments. This capability benefits teams that manage spreadsheets across various platforms. Instead of opening each file individually to add a label, you can incorporate annotations into an existing document-handling module. This functionality boosts your existing workflows and helps you handle recurring reports, internal reviews, and records that need clear identification before sharing.

Code to Add Watermark Annotations to XLS Files in Python

Watermark annotations are used to label XLS spreadsheets and make their status more visible. The GroupDocs.Annotation Cloud SDK for Python is all you need to add annotations to Excel files via a REST API. You do not need additional libraries or a dedicated local setup. From confidential financial reports to working spreadsheets awaiting approval, watermarks help recipients understand a file’s purpose at a glance. Our Python annotation API also supports platform-independent document management, letting developers process and share spreadsheets across teams or store for future reference.

If you found this tutorial helpful, refer to our related article on adding strikeout annotations to PDF files using the Python REST API. It explains how you can mark outdated text and make document reviews easier.