Add Watermark

What is Add Watermark?

Add Watermark stamps text or an image, such as "CONFIDENTIAL", a draft notice, or a company logo, onto every page of a PDF or just the ones you choose. Control the opacity, rotation, size and position so it doesn't overwhelm the original content.

How to use Add Watermark

1. Choose a PDF file, or drag and drop it into the tool.
2. Pick text or image watermark and adjust opacity, rotation, size and position.
3. Click Add Watermark, then download the result.

Features

• Text or image watermarks.
• Adjustable opacity, rotation, size and position.
• Apply to the whole document or selected pages only.
• 100% client-side — your PDF never leaves your browser.

Example: marking a draft contract before it goes out for review

A legal assistant has finished a first draft of a contract and needs to send it around for internal review, but wants to make sure nobody mistakes it for the signed version. Using a text watermark, she types "DRAFT" in place of the default "CONFIDENTIAL", keeps the rotation at 45 degrees for the classic diagonal stamp, and lowers the opacity to around 20% so the clauses underneath stay easy to read. She leaves the page grid untouched, which applies the watermark to every page, then downloads the marked-up PDF and forwards it for comment.

A photographer sharing proof images inside a PDF takes a different route: an image watermark with a small transparent-background PNG of their studio logo, sized to about 25% of the page width and placed in a bottom corner with 0 degrees of rotation, applied only to the pages containing photos by selecting them in the page grid first.

Tips for a cleaner watermark

• Opacity runs from 5% to 100% in the slider; for a page with a lot of text, 15-25% is usually enough to mark the document without fighting for attention with the content underneath.
• Rotation accepts any value from -180 to 180 degrees, not just fixed presets — 45 degrees gives the familiar diagonal stamp, while 0 degrees keeps a logo upright when placed in a corner.
• For image watermarks, a PNG with a transparent background blends into the page; a JPG will show as a solid rectangle behind the logo.
• Use Select all, Deselect all, or click individual pages in the page grid to limit the watermark to specific pages, such as skipping a cover sheet — leaving none selected applies it to every page.

Is Add Watermark safe?

Yes. Stamping happens locally with pdf-lib, whether it's rendered text or an uploaded image — a transparent PNG blends into the page while a JPG shows as a solid rectangle, but either way the file never leaves your browser or reaches a server.

Frequently Asked Questions

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