Add Watermark to PDF
Draw a diagonal text watermark across a PDF, with colour, size, angle and opacity control.
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
- Open the PDF.
- Type the watermark text and set colour, size, angle and opacity.
- 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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