Drafts under review
Mark a version as DRAFT before circulating it, so no one signs the wrong one by mistake.
Watermark a PDF
nothing leaves your device
Write CONFIDENTIAL, DRAFT or any text of your own across every page. Choose the size, the opacity and the angle, and see it on each page before downloading. All inside your browser: nothing is uploaded, and we never see the document.
100% free
Local processing
No sign-up
Your text only
You can also drag and drop a file anywhere on this page.•PDF · up to 100 MB
The documents that need a watermark are the ones you least want to upload
Nobody writes CONFIDENTIAL on a page that is not confidential. The word is a warning about what is inside, and sending that file to a stranger’s server to have the warning printed on it is a contradiction the whole category lives with.
Restricted material
CONFIDENTIAL, INTERNAL USE ONLY or a client name, written across every page at once.
Work sent as a sample
Portfolios, proposals and reports sent for evaluation, marked with your name.
How to add a watermark to a PDF
- 1
Open the document
Drop the PDF anywhere on this page, or use the button. The pages appear as thumbnails.
- 2
Type the text
Then pick the size, the opacity, the colour and whether it runs diagonally or straight across.
- 3
Check and download
The text appears on every thumbnail. Export when it looks the way you want.
What this tool does differently
The document is not uploaded
The watermark is written into the pages inside the tab. Nothing travels over the network, and you can verify it in the browser network panel.
Only your text
No service name, no logo and no advertising page. The only thing added to the file is what you typed.
Opacity you control
Light enough to read through, or strong enough that nobody misses it. Three levels, two colours.
The diagonal follows the page
It runs corner to corner instead of a fixed 45°, so it sits right on both portrait and landscape pages.
Long text is fitted, not cut
A long phrase is shrunk until it fits the page instead of running off the edge where you would only notice after downloading.
Every page at once
One text, applied to the whole document — including pages you added from another file in the same session.
Why the file stays with you
A document marked CONFIDENTIAL announces its own sensitivity. Here it is opened, marked and saved without leaving your machine.
Local processing
Reading the PDF, drawing the text and assembling the final file all happen in JavaScript, inside the tab.
No storage
There is no server keeping a copy, because there is no upload. Close the tab and everything leaves memory.
No account
No sign-up, no email, no daily limit tied to a login.
Frequently asked questions
Does a watermark protect the document?
It warns, it does not protect. A watermark is drawn into the page content, and anyone determined enough can remove it with the right software — that is true of every watermark, in every tool. Use it to say how a document should be treated, not to stop someone who has decided otherwise.
Can I use an image or a logo instead of text?
Not in this tool, which writes text. If you need an image on the pages, the signing tool places a drawn image wherever you choose, on the pages you select.
Can I watermark only some pages?
The watermark goes on every exported page. To mark only part of a document, extract those pages first with the split tool and watermark the result.
Which characters can I use?
The Latin alphabet with accents, cedillas, dashes and currency symbols — everything the standard PDF fonts cover. Alphabets such as Cyrillic, Greek and Chinese are not supported, and the tool tells you which characters it cannot write while you type, not after you export.
Does the watermark go behind or over the text?
Over it, with the opacity you chose. On the lighter settings the text underneath stays perfectly readable; on the strongest one the mark is clearly dominant.
Is the file uploaded to a server?
No. Open the network panel (F12) before exporting: no request carries the document. It is read, changed and saved in your browser.
Other PDF tools
PDF editor
Reorder, rotate and delete pages with a preview.
Add page numbers
Number the pages in the corner you choose.
Sign PDF
Draw your signature and place it on the pages.
Split PDF
Separate pages or extract a range.
All processing happens in your browser. No file is ever uploaded to a server.