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Add Watermark to PDF

Draw a diagonal text watermark across a PDF, with colour, size, angle and opacity control.

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Processing: This tool runs entirely in your browser. Your input and any file you open stay on your device — nothing is uploaded to a server. Limited by your device's memory rather than a server quota. Large scanned documents are the slowest.

How to use the add watermark to pdf

  1. Open the PDF.
  2. Type the watermark text and set colour, size, angle and opacity.
  3. Choose which pages to mark, then download.

About this tool

A watermark labels a document's status so a printed copy cannot be mistaken for the final version — DRAFT, CONFIDENTIAL, a client name, a date. It is drawn across the middle of each page at the angle and opacity you set, on top of the existing content.

Keep the opacity low, around 15–25%, so the text underneath stays readable. A watermark that obscures the document defeats its own purpose, and one that is too faint to notice does nothing.

Be clear about what this is: a visual mark, not protection. It can be removed by anyone with suitable software. If a document must not be altered or copied, that requires proper document security, not a label.

Common uses

  • Marking a draft so it is not mistaken for the signed version.
  • Labelling a document CONFIDENTIAL before circulating it.
  • Adding a client or project name across a proposal.

Frequently asked questions

Does a watermark protect my document?
No. It is a visible label and can be removed with the right tools. It discourages casual misuse; it is not security.
What opacity should I use?
Between 15% and 25% is usually right — clearly visible without making the text underneath hard to read.
Can I use an image as the watermark?
Not yet; this tool draws text. An image watermark is on the roadmap.

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