A watermark marks a PDF as a draft, confidential, or yours — across every page. This tool stamps your custom text diagonally over each page with adjustable opacity.
The watermark is applied in your browser, so the document is never uploaded.
How to use Add a Watermark to a PDF
Using Add a Watermark to a PDF takes only a few seconds and just four simple steps — no sign-up, no software, and nothing to learn:
- Type your text: Enter the watermark, like DRAFT or CONFIDENTIAL.
- Set opacity: Choose how subtle or bold the stamp should be.
- Upload a PDF: Add the document to watermark.
- Download: Save the watermarked PDF.
What you can do with Add a Watermark to a PDF
Add a Watermark to a PDF is built to do one job well, and gives you everything you need to get it exactly right:
Custom text. Stamp any word or phrase across the pages.
Diagonal on every page. Applied consistently to the whole document.
Adjustable opacity. From a faint mark to a bold overlay.
Free and private. No upload and no mark of ours added.
Mark documents as yours
Watermarks signal status and ownership and discourage unauthorised reuse. Applying one across an entire PDF here is instant, and because it runs locally, even sensitive contracts stay private.
Whether you need it once or every day, Add a Watermark to a PDF keeps the process quick and predictable. Because it focuses on a single task, there are no crowded menus to wade through — you open the page, set what you need, and get your result. That simplicity is exactly why a dedicated PDF tool beats a heavyweight editor for a job like this.
Everything runs in your browser
Unlike most online tools, Add a Watermark to a PDF never uploads your PDF to a server. The moment you choose a file, it is processed right here in your web browser using your own device's power. Nothing is sent over the internet, nothing is stored, and nothing is shared with anyone.
That gives you two real advantages. First, it is private: sensitive documents, ID photos and personal files never leave your computer or phone. Second, it is fast — there is no slow upload or download round-trip, so even large files are handled almost instantly. And it is completely free, with no watermark added to your result and no account required.
Tips for the best results
- Start from the highest-quality original you have — the better the input, the better the result from Add a Watermark to a PDF.
- Check the exact requirement — size, dimensions, or format — before you begin, so you only need to do it once.
- Custom text: Stamp any word or phrase across the pages.
- Diagonal on every page: Applied consistently to the whole document.
- Everything is repeatable — if the result isn't quite right, just adjust the settings and run it again. Nothing is uploaded, so you can try as many times as you like.
Frequently asked questions
Does it watermark every page?
Yes — the text is stamped diagonally across all pages of the PDF.
Can I remove it later?
It's drawn into the PDF, so keep the original if you need an unwatermarked copy.
Is my PDF uploaded?
No — the watermark is added in your browser.
Is Add a Watermark to a PDF free to use?
Yes — Add a Watermark to a PDF is completely free. There is no account to create, no subscription, and no watermark added to your result. Use it as many times as you need.
Do I need to install anything?
No. Add a Watermark to a PDF runs entirely in your web browser on any modern device — Windows, Mac, Android or iPhone. There is nothing to download or install.
Ready to start? Scroll back to the top, drop your PDF into Add a Watermark to a PDF, and download the finished file in seconds — free, private, and right inside your browser.