Add a watermark to PDF free
Add a custom text watermark to every page of your PDF — choose the text, size, opacity and angle. Runs fully in-browser.
Drop a file here, or browse
Processed in your browser — nothing is uploaded.
🔒 100% free · your files never leave your browser
Use this free tool to add a watermark to PDF pages — stamp text like “CONFIDENTIAL” or “DRAFT” across your whole document. Control the text, size, opacity and angle to get the look you want.
When you add a watermark to PDF files here, the work happens in your browser with no uploads, no sign-up and no NeuroScans branding added. Your document stays private.
How to Watermark PDF
- Upload your PDF.
- Type your watermark text and adjust size, opacity and angle.
- Click “Add Watermark”.
- Download the watermarked PDF.
Why use NeuroScans Watermark PDF?
- Stamp any text — CONFIDENTIAL, DRAFT, your name — on every page.
- Control size, opacity and rotation for the perfect look.
- Protect documents before sharing them.
- Free, with no NeuroScans branding added to your file.
- Applied in your browser — your PDF stays private.
When to use this tool
Adding a watermark to a PDF helps mark documents as drafts, label confidential files, or deter unauthorised reuse of your work before you send it to clients or colleagues.
Frequently asked questions
How do I add a text watermark to a PDF?
Upload your PDF, type your watermark text, adjust the size, opacity and angle, then click “Add Watermark” and download the result.
Can I control how the watermark looks?
Yes. You can set the watermark text, font size, opacity (transparency) and rotation angle before applying it.
Is this PDF watermark tool free?
Yes — it’s free with no sign-up, runs in your browser, and never adds its own branding to your file.
Can I make the watermark faint or bold?
Yes. The opacity slider lets you make the watermark subtle and barely-there or strong and prominent, and you can change its size and angle too.