Watermarks make spreadsheets easier to identify when they are shared outside their original workspace. In an XLS file, a watermark annotation can help indicate ownership and confidentiality. You can utilize this feature in Excel spreadsheets that need a visible label without changing the actual spreadsheet data. In this article, you will learn how to add watermark annotations to XLS files in Node.js applications using a handful of REST API calls.

Why annotate XLS with watermark annotations?

A watermark gives people a quick visual clue about how to handle a spreadsheet. It can show that an XLS file is under review, approved, or associated with a particular organization. Adding a watermark annotation also helps keep the document identifiable when different versions are circulated.

Steps to Add Watermark Annotations to XLS Files in Node.js

1. Import and set up GroupDocs.Annotation Cloud SDK for Node.js
2. Obtain your API credentials and configure them with AnnotateApi
3. Add the source XLS file with FileInfo
4. Create a watermark annotation and set properties with AnnotationInfo
5. Define annotation options like the output file path with AnnotateOptions
6. Send a request to annotate XLS and execute it with the annotate() method

The annotation workflow is straightforward. It starts by selecting the XLS spreadsheet you want to annotate with a watermark. You can create a watermark annotation and define its text, position, opacity, and other display settings. Send an annotation request via the Node.js REST API and access the annotated file after processing is complete. Adding watermark annotations to XLS workbooks helps users clearly highlight the purpose of a spreadsheet in a collaborative workspace. A visible label can distinguish an internal copy from a version intended for wider distribution. The approach works well for repetitive document tasks. Instead of opening individual spreadsheets and adding labels manually, you can handle XLS annotation workflows through REST API requests. It saves time when several Excel documents need the same type of watermark for templates and shared business documents.

Code to Add Watermark Annotations to XLS Files in Node.js

Watermark annotations make XLS spreadsheets easier to identify without rewriting their underlying data. The GroupDocs.Annotation Cloud Node.js SDK lets you work with XLS annotation tasks through Node.js-based REST API functionality. This lets you integrate spreadsheet watermarking into existing document workflows across business sectors that regularly exchange Excel files. For your personal and business workbooks, watermark annotations can communicate authenticity and ownership to end users regardless of their operating system or environment.

If you liked this article, please explore our related tutorial on adding strikeout annotations to PDFs using the Node.js REST API. It is a useful next step if your document workflow includes both spreadsheets and PDF files.