Add Watermark
Stamp text across every page as a watermark.
- 100% Private
- No Limits
- Works Offline
or drag and drop here
Stamp text like "CONFIDENTIAL" or "DRAFT" diagonally across every page. Runs locally in your browser — the document is never uploaded.
How to Use Add Watermark
- 1
Upload your PDF
Click the upload area or drag in the document you want to watermark.
- 2
Type your watermark text
Enter the text you want stamped across every page.
- 3
Adjust opacity
Choose how faint or bold the watermark appears over your content.
- 4
Apply and download
Your watermarked PDF downloads immediately — nothing is uploaded first.
Why Choose PurePDF for Add Watermark
Nothing leaves your device
The watermark is drawn locally via WebAssembly — your document is never uploaded.
Every page, automatically
No need to stamp pages one at a time — it applies to the whole document at once.
Control the opacity
Keep the watermark subtle or make it bold, depending on how it's used.
Common Use Cases for Add Watermark
Mark confidential documents
Stamp "CONFIDENTIAL" across a draft before sharing it internally.
Label a draft
Add "DRAFT" so no one mistakes a work-in-progress for the final version.
Claim ownership
Add your name or company across sample work before sending it to a client.
Pro Tips for Add Watermark
- Lower opacity (10-20%) keeps content readable underneath a watermark.
- Short text reads more clearly at a diagonal than long sentences.
- Flatten PDF afterward if you need to make sure the watermark can't be removed by editing form layers.
Frequently Asked Questions About Add Watermark
Will my PDF file be uploaded to a server?
No — nothing is uploaded. This tool runs entirely in your browser via WebAssembly/JavaScript; your file never leaves your device.
Is there a file-size limit, a usage cap, or a hidden fee?
It's free and unlimited, with no watermark and no forced file-size cap — the only real limit is your own device's memory for very large files.
Do I need to create an account or sign up?
No — no account, email, or sign-up is required for any tool. Just start using it.
Can I use this on my phone (iPhone or Android)?
Yes — it works in any modern mobile browser, no app install needed.
What opacity setting is recommended so document content remains legible?
A low opacity setting of approximately 10% to 20% is recommended so the diagonal watermark is clearly visible while keeping the underlying text easy to read.
How can I make the watermark harder to remove after downloading?
Run the watermarked document through the Flatten PDF tool afterward to merge the watermark into the page content, so it can't be separated out by editing form or annotation layers.