Watermark PDF

0 uploads — runs entirely in your browser, works offline

Drag files here, or .

Stamp diagonal watermark text across every page. Nothing is uploaded.

Watermark PDF — stamp text on every page

Add a diagonal text watermark across every page of a PDF. It runs entirely in your browser (0 uploads, works offline).

How to use it

  1. Add your PDF.
  2. Enter the watermark text and opacity.
  3. Download the watermarked PDF.

FAQ

How do I watermark a PDF for free?

Add the PDF, type your text such as CONFIDENTIAL or DRAFT, set the opacity, and this page stamps it diagonally across every page — on your device with no upload.

Is my PDF uploaded anywhere?

No. Watermarking happens entirely in your browser and nothing is transmitted or stored, which you can verify by turning off your Wi-Fi — which matters for confidential documents.

Can I control how visible it is?

Yes — set the opacity from faint to bold so the watermark is clear without hiding the content.

Does it change the original text?

No — the watermark is drawn over the existing content, which is left intact underneath.

Limits

Adds a single centred, diagonal text watermark; image watermarks and per-page text are not supported.

Related

The add-page-numbers tool numbers pages; the metadata editor sets document properties.

Bookmark this page (Ctrl+D, or ⌘D on Mac) or install the app — it works offline the next time you need it.