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MyPDFToolbox

Add Watermark

Client-side

Stamp a text watermark on every page, with size, angle and opacity.

Runs 100% in your browser · Options are saved only in this browser, if you allow it — never your files

Drag and drop your PDF here

or

Up to 100 MB per file · Your files never leave your device.

Layout

What is a PDF watermark?

A watermark is text printed across the pages of a document to show its status or owner – “CONFIDENTIAL”, “DRAFT”, “COPY”, “SAMPLE” or your company name. It discourages unauthorised sharing, makes clear that a version is not final and identifies where a copy came from. This tool stamps your text on every page of a PDF, or only on the pages you choose, with full control over its size, color, transparency and angle.

Added in your browser, without uploads

The watermark is drawn by the open-source pdf-lib library inside your browser. Documents that need a watermark are often the sensitive ones, so it matters that yours never travels to a server: it is read from your disk, stamped in memory and handed back as a download. A preview of the first page lets you check the result before sharing it.

How to add a watermark

  1. Drop your PDF onto the drop zone or click Choose file.
  2. Type the watermark text, up to 80 characters.
  3. Adjust its appearance:
    • Font size from 12 to 160 points.
    • Opacity: around 20–30% keeps the content readable; 100% makes the mark solid.
    • Angle: diagonal (45°), horizontal, the opposite diagonal or vertical.
    • Color: any color from the picker; red and grey are the most common.
    • Layout: a single mark in the center, or repeated across the whole page so it cannot be cropped out easily.
  4. Optionally limit it to some pages, for example 2- to skip the cover.
  5. Click Add watermark, check the preview and download the new file.

The tool remembers your style settings in this browser if you allow it, so a recurring watermark takes a single click next time. The document itself is never stored.

Good to know

The watermark is placed on top of the page content as real text, so it stays sharp at any zoom level and prints cleanly. Pages that are rotated inside the PDF are handled automatically, so the mark always appears at the angle you chose. The standard PDF fonts used here support Latin alphabets, including accents and characters such as ñ, ç and ß; other scripts are reported with a clear message.

Frequently asked questions

Can a watermark be removed?

A determined person with PDF editing software can remove or cover text watermarks. They are a clear visual signal, not a security measure. To restrict who can open a file, use Protect PDF as well.

Does it change the original file?

No. A new document is created and your original stays untouched on your device.