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How to add watermark text to a PDF file?
Take WPS 20 19 as an example:

How to add watermark text to PDF file? You can use WPS to refer to the following steps:

1. Open the "PDF" document;

2. Click on the "insert-watermark" to customize, or directly choose to use the "default watermark";

3. If you don't want others to modify the watermark after setting, you can click "Protection-Document Encryption" to set the password.