Add Watermark to PDF
Stamp a text watermark across every page of a PDF for free — entirely in your browser. Mark documents CONFIDENTIAL, DRAFT or with your name, and control the size, angle and opacity. Your file is never uploaded to a server.
How to add a watermark to a PDF
- Open the tool and add your PDF.
- Type your watermark text and set the size, angle, colour and opacity — optionally tiled across the page.
- Apply and save, built on your device — free, with no added branding.
Watermarked on your device — never uploaded
Most “watermark PDF” websites upload your document to their servers. LambiPdf stamps the text using your own browser, so contracts and drafts never leave your computer. It's free, needs no account, and — unlike many free tools — adds no watermark branding of its own.
Full control over the look
Set any text (CONFIDENTIAL, DRAFT, a name or date), choose the size, rotation angle, colour and opacity, and optionally tile it to repeat across the whole page. The watermark is applied to every page and baked into the saved PDF.
More free PDF tools
Watermark PDF — FAQ
Is the Watermark PDF tool free?
Yes — completely free, with no sign-up, and it adds no branding of its own.
Are my files uploaded?
No. The watermark is applied entirely in your browser; your PDF never leaves your device.
Can I change the angle and opacity?
Yes — size, angle, colour and opacity are all adjustable, and the watermark can be tiled.
Does it watermark every page?
Yes — the text is stamped across all pages of the document.
Can I use my own logo image?
For an image stamp, use the Sign / Stamp tool to place a logo or signature.