Can I adjust the opacity so the text underneath remains readable?

Yes! You can slide opacity from 10% to 100% to ensure underlying document text is clearly legible.

Can I add a custom text string?

Yes, you can type any custom text, company name, or date you wish.

Will adding a watermark bloat my file size?

No. Our vector text watermarks add virtually zero file weight to your document.

Is my document uploaded anywhere?

No. The stamping is executed directly in your browser.

Edit PDF

Add Watermark to PDF Online for Free

Stamp custom text or image watermarks across your PDF pages to protect your intellectual property.

Drag & drop your PDF file here

or click to browse • paste with Ctrl+V

Max file size: 50 MB•100% Private (In-Browser)

What is Add Watermark to PDF?

Adding a watermark to a PDF overlays text or logo stamps across your pages, indicating document status such as Confidential, Draft, or Sample, and protecting intellectual property. Freeallpdf applies customizable watermarks directly in your browser with real-time visual previews.

Customize your watermark text (such as "CONFIDENTIAL", "DRAFT", "DO NOT COPY", or your company name), adjust font size, opacity, color, and diagonal rotation angle.

Watermarks are rendered directly onto page layers, clearly communicating ownership and sensitivity to every recipient.

How to Use Add Watermark to PDF

Follow these simple steps to process your files in seconds.

Upload PDF

Select the document you want to stamp with a watermark.

Configure Watermark

Type your custom text, set font size, opacity, color, and rotation.

Preview on Page

Inspect the live visual watermark preview on your document.

Download Watermarked PDF

Save your securely stamped PDF document with one click.

Key Features

Custom text stamping with adjustable opacity, font size, and color

Configurable rotation angle: diagonal 45°, horizontal, or vertical

Apply to all pages or select specific page ranges

Clean vector typography rendering

In-browser execution keeps confidential drafts 100% private

Why Use Our Add Watermark to PDF?

Intellectual Property Protection

Discourage unauthorized leaks of preliminary research and screenplays.

Audit Trail Clarity

Clearly demarcate "SAMPLE", "VOID", or "CLIENT REVIEW ONLY" across agreements.

Corporate Branding

Subtly reinforce brand ownership across publicly downloadable whitepapers.

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Frequently Asked Questions

Everything you need to know about Add Watermark to PDF and document privacy.

Our engine applies the watermark as a native graphics layer across every page, making casual removal impossible in standard PDF viewers.