Smart PDF Lab

Add Watermark

Stamp a text watermark on every PDF page. Adjustable opacity, rotation, and position. Free, no signup, up to 200MB.

3 free operations remaining today

Drop your PDF here

Stamp a text watermark on every page

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Step by step

How to Add a Watermark to PDF

Smart PDF Lab adds custom watermarks to PDFs in four steps with full visual control.

1

Upload your PDF.

Drop your PDF or click Browse files to upload documents up to 200MB.

2

Enter your watermark text.

Type the text you want stamped across every page.

3

Adjust appearance.

Set opacity, rotation, font, size, and color to match your needs.

4

Download the result.

Save your watermarked PDF directly to your device.

Why Smart PDF Lab

Why Add Watermarks With Smart PDF Lab

Smart PDF Lab protects your documents and signals authorship without expensive software. Add "Draft," "Confidential," "Sample," or "Internal Use" stamps to control how your PDFs are shared. Brand contracts with company names. Mark unreleased reports as preliminary. Apply ownership stamps to proposals and creative work.

The watermark applies to every page automatically with full control over opacity, rotation, and positioning. Files up to 200MB, no signup, no watermark on the Smart PDF Lab service itself.

Reference

Watermark Style Controls

Every visual aspect of your watermark is adjustable:

Opacity

Slide from 10% (subtle background mark) to 100% (fully solid).

Rotation

Set any angle from 0° to 360°, with 45° as the classic diagonal style.

Position

Center the watermark, place it diagonally, or position in specific corners.

Font and size

Choose from standard fonts with sizes from 12pt to 144pt.

Color

Full color picker for matching brand or document tone.

Page range

Apply to all pages or specific page ranges only.

Will the watermark cover my PDF content?
Adjust opacity to control visibility. Most professional watermarks use 20-30% opacity so original content remains fully readable underneath.
Can I add an image watermark instead of text?
The current tool supports text watermarks only. Image watermarks are on the roadmap for a future update.
Can watermarks be removed from the final PDF?
Watermarks stamp permanently into the PDF. They cannot be removed without specialized PDF editing software, which is the point of using them.
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