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Add a watermark to a PDF — free
Stamp “CONFIDENTIAL”, “DRAFT”, or any text across your PDF. Real PDF Editor lets you control the text, opacity, size, and diagonal angle, then download — free and entirely in your browser.
100% free · no sign-up · files never leave your device
Add a CONFIDENTIAL or DRAFT watermark
Type any label you need — CONFIDENTIAL, DRAFT, a company name, or “SAMPLE” — and control how bold or faint it appears with the opacity and size sliders. Place it diagonally across the page or flat, and it's applied to every page in one step.
Watermark a PDF free, without Adobe
You don't need Adobe Acrobat to watermark a PDF. Real PDF Editor adds your watermark in the browser for free — and, unlike many “free” tools, we never stamp a watermark of our own on your download.
How it works
- 1
Open the PDF
Launch the editor and open the document you want to watermark.
- 2
Open Watermark
Go to Tools → Watermark.
- 3
Set your text & style
Type the watermark text and adjust opacity, size, and whether it sits diagonally.
- 4
Download
Apply and download the watermarked PDF.
Why use Real PDF Editor
- Custom text with adjustable opacity and size
- Straight or diagonal placement
- Applies to every page at once
- Free, private, and added by you — not us
Frequently asked
How do I add a watermark to a PDF?
Open your PDF in Real PDF Editor, go to Tools → Watermark, type your text and set the opacity, size, and angle, then download. The watermark is applied to every page.
Can I add a watermark to a PDF for free?
Yes. Adding your own watermark is free, and we never add a watermark of our own to your downloads.
How do I add a “CONFIDENTIAL” or “DRAFT” watermark in a PDF?
Type CONFIDENTIAL, DRAFT, or any text into the watermark box and adjust the opacity and size so it reads clearly without hiding the content.
How do I add a watermark to a PDF without Adobe?
Real PDF Editor adds watermarks in the browser for free — no Adobe Acrobat or install needed.
Can I add a watermark to a PDF on a Mac?
Yes — open the watermark tool in any Mac browser, set your text and style, and download the watermarked PDF.
Are my files uploaded when I add a watermark?
No. The watermark is applied in your browser, so the document never leaves your device.