PDF tools / Edit PDFs

Add watermark

Stamp angled, translucent text across every PDF page. Everything stays on your device.

Drop PDF files here

or click to choose files

How it works

  1. Choose your PDF files.
  2. Set the options, then select “Add watermark”.
  3. Download the result directly from your browser, with batches packaged as a ZIP.

What this tool does

Set the watermark text, opacity, rotation, and font size. The same centered text watermark is added to every page.

Before you start

This tool adds text watermarks only; image logos, tiled patterns, and per-page watermark settings are not supported.

Private by design

The file is read and processed by this page on your device. It is never uploaded to FormatOtter or handed to a third-party conversion service. Large documents may take a moment because your browser is doing the actual work.

Related PDF tools

  • Rotate PDFRotate every page or a selected set of pages clockwise.
  • Add page numbersStamp configurable page numbers onto a PDF.
  • Crop PDFCrop page edges by exact point measurements.