Add Watermark to PDF – Text or Logo Watermark Free Online

Stamp text or an image over your PDF pages.

Choose PDF file

or drop a PDF here

Your files stay on your device — nothing is uploaded.

Add Watermark stamps text such as CONFIDENTIAL or DRAFT, or your own logo, across every page of a PDF. Adjust colour, angle, size and transparency with a live preview — without uploading your document.

How to add a watermark to a PDF

  1. Click "Choose PDF file" or drag and drop a PDF into the box.
  2. Choose "Text" and type your watermark, or choose "Image / logo" and pick a picture.
  3. Set the size, colour, angle and opacity — the preview shows the result.
  4. Click "Add watermark" and then "Download PDF".

Why use ZentaPDF Add Watermark?

100% privateFiles are processed in your browser. Nothing is uploaded to any server.
Free, no sign-upNo account, no email, no watermark and no daily limits.
FastNo upload or download wait — results are ready in seconds.
Works everywhereUse it on Windows, Mac, Linux, Android or iPhone in any modern browser.
Original qualityPages are copied as they are — text and images stay crisp.
Large filesHandle big files and many pages — limited only by your device’s memory.

Frequently asked questions

Are my files uploaded to a server?

No. ZentaPDF processes your files inside your own browser using JavaScript. Nothing is uploaded, so nobody else can see your documents — not even us.

Can I use my company logo as a watermark?

Yes. Choose "Image / logo" and select a PNG or JPG. PNG logos with a transparent background look best.

Can people remove the watermark?

The watermark becomes part of each page. It cannot be removed in normal PDF readers, although advanced PDF editors can edit page content.

Which languages can I use for text watermarks?

Text watermarks currently support English letters, numbers and common symbols. For other scripts, use an image watermark.

Is it really free? Do you add a watermark?

Yes, it is completely free with no sign-up, no watermark and no daily limits. The site is supported by a few non-intrusive ads.

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