Add Watermark to PDF Online – Text or Image Watermark
PDFmuto adds a text watermark to every page of a PDF in your browser. Nothing is uploaded to a server.
- No file limits
- No registration
- Free forever
- PDFs never leave your browser
Drop your PDF here
Supported format: PDF
The watermark is drawn across the center of every page. Your original file is never touched.
How to Watermark a PDF
Upload PDF
Drop the PDF you want to stamp onto the page.
Add Text Watermark
Type the words to stamp, such as CONFIDENTIAL, DRAFT, or your company name.
Adjust Opacity, Position, Rotation
Set how visible the stamp is, how big, and whether it sits diagonally, horizontally, or vertically.
Download Watermarked PDF
Click the button and download your stamped document.
Protect Your Documents with Watermarks
A visible watermark discourages unauthorized redistribution and makes leaks traceable — a DRAFT or CONFIDENTIAL stamp is hard to miss.
Watermarking before sharing also signals the document status, so recipients know at a glance that a file is not final.
Watermark Options
| Text | Any words you type |
|---|---|
| Opacity | Adjustable 5-100% |
| Rotation | Diagonal, horizontal, vertical |
| Registration | Not required |
| Upload | None, processed on your device |
Your PDFs never leave your browser
All processing happens locally on your device. Nothing is uploaded to a server, stored, or tracked.
Frequently asked questions
Can I adjust the watermark opacity?
Yes. Slide from very light to nearly solid so the stamp is visible without hiding the content underneath.
Can the watermark be rotated?
Yes — diagonal is the default, and horizontal or vertical are one click away.
Does the watermark change the content?
No. Only the stamp is drawn on top; the pages themselves are not modified.
Learn more about PDFs
Read practical guides for working with PDFs without uploading your files. Browse all guides →