Watermark PDF
PDF & DocumentsStamp text or an image watermark across every page of a PDF.
What is Watermark PDF?
Watermark PDF stamps a text label or an image across every page of your document — perfect for marking files CONFIDENTIAL, DRAFT, or with your own logo. You control the wording, colour, size, opacity, rotation, and whether it sits once in the centre or repeats diagonally across the whole page, with a live preview of the first page as you tweak. It runs entirely in your browser using pdfjs for the preview and pdf-lib to write the watermark, so your PDF is never uploaded.
How to use Watermark PDF
Add your PDF
Drop a PDF onto the page or click to browse. The first page renders as a live preview you'll watermark against.
Choose text or image
Pick a text watermark and type your wording, or switch to Image and upload a PNG or JPG — a transparent PNG logo works best.
Style it
Adjust the font size and colour (or image size), then set the opacity and rotation. The preview updates instantly so you can dial in a subtle or bold look.
Pick a placement
Choose Tiled to repeat the watermark diagonally across the whole page, or Centered to place it once in the middle of every page.
Download the watermarked PDF
Click Download watermarked PDF. The watermark is drawn onto every page and the new file downloads instantly.
Common uses
- Mark a document CONFIDENTIAL, DRAFT, or COPY before sharing
- Stamp your company logo across a proposal or report
- Add a 'SAMPLE' or 'SPECIMEN' overlay to a template
- Brand a PDF portfolio or invoice with your name
- Deter copying by tiling your name across every page
- Label internal documents so they aren't mistaken for final versions
Why choose Super File Tools
Privacy-first
Most tools process your files inside your browser and never upload them to a server.
Free, no account
No sign-up, no watermark, no paid tier. Just open a tool and use it.
Instant
For local tools, work starts the moment you drop a file — no upload or queue.
Runs in your browser
Most tools are built on open web standards and work on any modern desktop browser.
No upload size caps
For local tools, nothing leaves your device, so the only limit is your machine’s memory.
Yours to keep
Results download straight to your device in clean, standard file formats.