A Quick Guide to Watermarking

written by Ricky Lim on 2025-04-12

In many situations - whether it's for personal (e.g travel documents) or professional setting (e.g business contracts) - we're dealing with sensitive documents. We want to ensure that these documents are marked as CONFIDENTIAL. Adding a watermark is a simple way to make this explicit.

Here’s how you can do it using Python with the watermark library:

• Single File Example: Add a grid watermark to a report called report.pdf:

$ uvx watermark grid report.pdf "CONFIDENTIAL" -h 3 -v 3 -s watermarked_report.pdf

• Batch Processing: Apply the same grid watermark to all PDFs in a folder:

$ uvx watermark grid report_folder "CONFIDENTIAL" -h 3 -v 3 -s watermarked_folder

This approach is quick, and works for both individual files and batches.

Key Takeaways

Using watermark is an easy yet powerful way to mark your documents as confidential. Give it a try and watermark your documents effortlessly!