Add Watermark to PDF
Stamp every page of your PDF with a custom text watermark — free, instant, full control over text and opacity.
- ✓ Free
- ✓ Custom text
- ✓ Opacity slider
- ✓ No sign-up
or drag and drop your PDF here
By using this tool you agree to our terms of use
Drag thumbnails to reorder · click to select
Why use PDF99?
Any text you need
Use CONFIDENTIAL, DRAFT, your company name, or any other text up to 50 characters. Placed diagonally at the page centre.
Opacity slider
From 5% (barely visible) to 80% (prominent). Adjust to suit your document — light for reading convenience, bold for strong deterrence.
Applied to every page
The watermark is added to all pages automatically.
Diagonal placement
Watermarks are placed at 45° — the standard for confidentiality or draft stamps.
Processed in browser
PDF-lib adds the watermark locally. Your document doesn't leave your device.
No PDF99 branding
The only mark on your PDF is the one you choose.
What is a PDF watermark?
A watermark is a semi-transparent text or image overlaid on document pages to indicate status, ownership or handling instructions. Common watermarks include CONFIDENTIAL, DRAFT, DO NOT COPY or a company name. They signal to recipients how a document should be treated without obscuring the content. PDF watermarks are added to the page canvas rather than embedded in the page text, so they appear on every page when viewed or printed.
How to add a watermark to a PDF
Upload your PDF
Choose the PDF you want to watermark.
Set text and opacity
Enter your watermark text and choose how visible it should be.
Download
Click Add Watermark and download your stamped PDF.
Frequently asked questions
Any text up to 50 characters. CONFIDENTIAL, DRAFT, DO NOT DISTRIBUTE, or a company name work well.
Currently grey. Colour options are coming.
Text watermarks can be removed by anyone with PDF editing software. Combine with password protection for stronger security.
Never.
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