Is the watermark permanent?

Yes. The watermark is baked into the page content stream and cannot be removed by a simple PDF viewer.

Can I use my company logo?

Yes. Switch to the Image tab, upload a PNG or JPEG logo, and adjust the size and position.

Will text in the PDF remain selectable?

Yes for text watermarks. Image watermarks rasterize affected pages, which may affect text selectability on those pages.

Zero upload
Local CPU
Offline-capable
Auto cleanup

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annotate / Watermark

Watermark

Add text or image watermarks.

A watermark is a visual marker only. It does not establish copyright or legal ownership.

Add at least one PDF in the file tray to begin.

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Methodology & Technical Transparency

Libraries used

pdf-lib — Core PDF construction and editing logic
pdf.js — PDF rendering and page rasterisation

Memory strategy

After each operation, URL.revokeObjectURL() is called immediately. All pdf.js document handles are destroyed via pdfDoc.destroy(). Workers are terminated on completion or component unmount.

We do not guarantee the permanent storage of files (as we don't store them). Processing of password-protected files is not supported locally.

Key Features

Text and image watermarks
Add a repeating text stamp or overlay your logo on every page of the PDF.
Full style control
Adjust angle, opacity, font size, and tile spacing to match your brand or security requirements.
Live preview
See exactly how the watermark will appear on the page before applying it.

Common Use Cases

Commonly used to mark draft versions of contracts, brand client proposals before sharing, or add 'CONFIDENTIAL' stamps to sensitive internal reports.

Frequently Asked Questions

Is the watermark permanent?: Yes. The watermark is baked into the page content stream and cannot be removed by a simple PDF viewer.
Can I use my company logo?: Yes. Switch to the Image tab, upload a PNG or JPEG logo, and adjust the size and position.
Will text in the PDF remain selectable?: Yes for text watermarks. Image watermarks rasterize affected pages, which may affect text selectability on those pages.