CalcBusinessCalculators for real decisions
Free PDF tool

Add Watermark to PDF

Stamp any text on every page — confidential, draft, do not copy, or any custom label. Adjust opacity, size, and position. Runs in your browser.

Private by default

Your files stay in your browser.

Fast

Built for quick document tasks.

Free

No account or paywall.

Click or drag a PDF here

PDF only

How to use it

  1. 1Upload your PDF file by clicking or dragging it into the drop zone.
  2. 2Type your watermark text and choose position, size, color, and opacity.
  3. 3Click 'Add watermark & download' — the file is ready instantly.

More PDF tools

Merge PDF

Combine multiple PDF files in your browser.

Split PDF

Extract selected pages from a PDF.

Reorder PDF

Rebuild a PDF in the page order you choose.

Delete PDF Pages

Remove selected pages and download a clean file.

Rotate PDF

Rotate every page of a PDF in your browser.

FAQ

Is my PDF uploaded to a server?

No. The watermark is applied entirely in your browser using pdf-lib. Your file never leaves your device.

Can I add a transparent watermark?

Yes. Use the Opacity slider to control transparency — lower values produce a lighter, more subtle watermark.

What fonts are available?

The watermark uses Helvetica Bold, a clean built-in PDF font that renders reliably on all devices.

Can I position the watermark anywhere?

You can choose diagonal (center of page, rotated), center (horizontal), or bottom-right placement.