PDF Watermark

Add a text watermark to every page in your PDF.

Files never leave your browser

Drop a PDF file here

or

How it works

Add a watermark to any PDF in three simple steps — no software to install, no accounts to create.

1

Upload your PDF

Drop or browse to select a PDF file. All pages are detected automatically.

2

Customize watermark

Set the text, font size, opacity, color, and rotation angle. Preview updates in real time.

3

Download

Click download to save the watermarked PDF. Your file is generated instantly in the browser.

Why use KepTools to watermark PDFs?

100% private

Your files never leave your browser. All processing happens locally on your device — nothing is uploaded to any server.

No account needed

Start watermarking right away. No sign-ups, no email verification, no passwords — just open the page and go.

Free, no limits

No file-size caps, no daily quotas, no watermarks on our watermarks. Use it as much as you want.

Lightning fast

Because everything runs in your browser, there's no waiting for uploads or server processing. Results are instant.