Watermark PDF

Stamp a text watermark across every page of a PDF. Everything runs locally in your browser — your file is never uploaded.

Choose a PDF file

Watermark text

Font size

Opacity (0–1)

How to watermark a PDF

Select your PDF file.
Type the watermark text — such as "CONFIDENTIAL", "DRAFT" or your company name.
Adjust the font size and opacity to your liking.
Click "Add Watermark" and download the stamped file.

Why watermark PDFs

A watermark marks ownership and discourages unauthorised sharing. Businesses stamp contracts and internal reports, educators mark drafts and exams, and freelancers brand portfolios before sending them to prospective clients.

Choosing the right opacity

A low opacity (around 0.25) keeps the document readable while still marking it. Use a higher opacity for a stronger, more visible stamp. The watermark sits diagonally across the middle of each page so it cannot be cropped away easily.

Text only, no images needed

This tool adds a clean text watermark. For an image or logo watermark, convert your logo to a small image first — the text approach is ideal for words like DRAFT, CONFIDENTIAL and SAMPLE.

Frequently asked questions

Yes — type any text you like, such as your brand name or a confidential notice.

Yes, the text is stamped diagonally across every page of the document.

It becomes part of the PDF content, so it cannot be removed without specialised editing tools.