Add a watermark to PDF

Mark documents as confidential, draft or copyrighted with a text or logo watermark. A live preview shows exactly how page 1 will look.

Uploaded to servers0 B
Processed locally0 B
Type
Angle
Layout
Preview · page 1

Why your files stay on your device

Nothing is uploaded

Most online PDF sites send your file to their servers. PDFMoss does the work inside your browser, so there is nothing to intercept, store or leak.

No limits on uses

There are no daily caps because there are no servers doing the work. Use any tool as often as you like.

Works on your phone

Every tool works on iPhone and Android: pick photos from your gallery and sign with your finger.

Original quality, works offline

Pages and images keep their quality, and once you install the app the tools work without an internet connection.

How to add a watermark to a PDF

  1. Drop a PDF on the page or click to choose it.
  2. Type your text or choose an image, then adjust color, opacity, size and angle.
  3. Click Add watermark and download the PDF.

Frequently asked questions

Can the watermark be in any language?

Yes. Text is drawn by your browser, so Chinese, Japanese, Arabic and other scripts all work.

Can I use my logo?

Yes. Switch the type to Image and choose a PNG or JPG. A PNG with a transparent background looks best.

What does Tiled do?

Tiled repeats the watermark across the whole page, which makes it harder to crop out of screenshots.

Are my files uploaded to a server?

No. PDFMoss processes files inside your browser. The counter at the top of the page shows 0 B uploaded because nothing is sent.

Is PDFMoss free?

Yes. Every tool is free to use with no sign-up and no watermark on your files.