Text Watermark - Free Online Browser Tool

Add diagonal, semi-transparent text watermarks across pages.

A diagonal watermark is the standard way to mark a document DRAFT, CONFIDENTIAL or FINAL so it cannot be mistaken for something else. This tool stamps translucent text diagonally across every page, angled so it reads across the content without hiding it.

This text watermark utility runs completely inside your web browser. Your document is opened locally and processed on your own device using JavaScript and WebAssembly, so your file is never uploaded to any server. There is no signup, no watermark and no limit on how many documents you can handle.

  • 100% client-side - files never leave your device
  • Instant processing, no upload wait
  • Works on desktop, tablet and mobile
  • Free forever, no account required

Common next steps: Protective Order Confidentiality Header, Add Text Overlay, Add Image to PDF Page, Image Watermark (Logo).

How to Use the Text Watermark Tool

Four steps, and the whole thing runs locally on your own device.

  1. Load the document

    Drop in the PDF you need to mark.

  2. Enter the watermark text

    Type the word or phrase — DRAFT, CONFIDENTIAL, SAMPLE, DO NOT COPY — in the language you need.

  3. Adjust the look

    Set transparency, font size and colour. High transparency keeps the page readable underneath.

  4. Apply across the document

    The watermark is stamped diagonally on every page. Download the marked file when it looks right.

Frequently Asked Questions

How transparent should the watermark be?

Enough that the underlying text stays perfectly readable — around 15–25% opacity works well for a diagonal mark that still announces itself.

Will the watermark be removable?

No. It is drawn into the page content as real vector text, so it cannot be selected out or deleted like an annotation.

Can I change the angle?

Yes, the rotation angle is adjustable. The default diagonal is the classic choice because it reads as a watermark rather than as text.

Does it cover every page or just one?

Every page in the document, which is what makes it a watermark rather than a stamp.

Is this different from Add Watermark?

The Add Watermark tool exposes the rotation angle and font size directly, while this one is the quick, preset-oriented version. Both produce the same kind of result.