Free PDF Watermark Tool - Add Watermark to PDF Online
Stamp a text or image watermark on every page of your PDF. Control opacity, position, and size. Runs entirely in your browser — no uploads.
What is Add Watermark?
Protect your PDF documents and establish ownership with a professional watermark. Our free PDF Watermark tool lets you add either a text watermark (like "CONFIDENTIAL", "DRAFT", or your company name) or an image watermark (like a logo) to every page of your PDF.
Customize the watermark to match your needs: adjust opacity so content remains readable through the watermark, choose position (center diagonal, top-left, bottom-right, etc.), and set font size or image dimensions. A real-time preview shows exactly how the watermark will appear on the page before you apply it.
The watermark is rendered onto each page using pdf-lib, which draws the text or image directly onto the PDF content layer. This means the watermark is visible in every PDF viewer and printer, and is permanently part of the document.
Since everything processes in your browser, your confidential documents never need to leave your device. Add branding, copyright notices, or draft markings to PDFs instantly and privately.
Powerful Features
Everything you need in one amazing tool
Text Watermarks
Type any text (DRAFT, CONFIDENTIAL, your name) with full font and size control.
Image Watermarks
Upload a logo or signature image to use as a watermark across all pages.
Opacity Control
Set watermark opacity from 10% to 100%. Keep content visible through the overlay.
Position Options
Center diagonal, top corner, bottom corner, or custom position on the page.
Live Preview
See exactly how the watermark looks on your page before applying to all pages.
Private Processing
Watermarking runs in your browser with pdf-lib. Files never leave your device.
How It Works
Get started in 4 easy steps
Upload Your PDF
Select or drop your PDF. A page preview renders immediately.
Configure Watermark
Enter text or upload an image. Set opacity, position, and font size.
Preview
Check the watermark preview on the page. Adjust until it looks right.
Download Watermarked PDF
Click Apply. pdf-lib stamps every page and downloads the watermarked PDF.
Why Choose Our Add Watermark?
Stand out from the competition
No Upload Required
Your PDF and logo never leave your device. Watermarking is entirely in-browser.
Preview Before Applying
No surprises — check the watermark on a real page preview before committing.
Permanent & Universal
Watermarks are embedded in the PDF and appear in every viewer and printer.
Full Customization
Text or image, any opacity, any position — complete control over the result.
All Pages at Once
A single operation stamps the watermark consistently on every page simultaneously.
Free & Private
No account, no upload. Watermarking is free and your files never leave your device.
Perfect For
See how others are using this tool
Draft Documents
Stamp "DRAFT" on document versions to prevent confusion with final files.
Confidentiality
Mark sensitive PDFs as "CONFIDENTIAL" before sharing with external parties.
Branding
Add company logo or name watermark to branded PDFs before distribution.
Copyright Protection
Watermark your creative work before sharing to assert and protect ownership.
Sample Documents
Mark review copies with SAMPLE so recipients know the document is not yet final.
Internal Use Only
Stamp INTERNAL USE ONLY on HR policies and internal memos before distribution.
Frequently Asked Questions
Everything you need to know about Add Watermark
Yes. Upload a PNG (with transparency for best results) or JPG as your watermark image.
No. The watermark is drawn as a visual overlay. The underlying text layer is preserved and still searchable.
The watermark is embedded in the visual layer of the PDF. It cannot be removed without re-editing the PDF with a tool that supports layer editing.
No. Everything runs in your browser using pdf-lib. Your files never leave your device.
Yes. Choose between watermarking all pages at once or selecting specific page ranges.
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