Add Watermark to PDF
Stamp a text watermark like DRAFT or CONFIDENTIAL across every page, in your browser, with nothing uploaded.
Files processed in your browserSelect a PDF or drag & drop
One PDF, up to 100 MB
Your files never leave your device. Add Watermark to PDF runs entirely in your browser using JavaScript. Nothing is uploaded to a server. When you close this tab, your file is gone from memory.
How to add watermark to pdf
- Select your PDF. Choose or drag in the PDF to watermark.
- Enter the text. Type your watermark, such as CONFIDENTIAL or DRAFT.
- Adjust the look. Pick a layout and set opacity and size.
- Apply & download. Press Add watermark and download. Nothing is uploaded.
Want more detail? Read our full guide: How to add a watermark to a PDF.
Why watermark a PDF?
A watermark answers a question every reader silently asks: what is this file, and how should I treat it? Stamped across the page, a word like DRAFT stops a colleague from acting on a version that isn't final; CONFIDENTIAL signals that a document shouldn't be forwarded; a company name or "DO NOT COPY" asserts ownership on work that might otherwise circulate untethered from its source. It is context you can't misread, printed into the page itself rather than tucked in a filename that vanishes the moment the file is renamed.
The look matters as much as the words. A watermark that's too bold fights with the text; too faint and it's missed entirely. This tool lets you set opacity anywhere from a barely there 5% wash to an unmissable 80%, and choose the size to suit the page, so the mark reads clearly without burying the content underneath. A tiled diagonal pattern repeats across the whole page for maximum coverage, while a single centered stamp is cleaner for a cover sheet or a one-page notice.
Common uses run from the everyday to the legal: labelling proposals as SAMPLE before a price is agreed, marking student handouts as SPECIMEN, tagging design mockups so a preview can't be passed off as the delivered artwork, or flagging internal memos as INTERNAL USE ONLY. Worth knowing where the line is, though: a drawn-on watermark is a visible deterrent and a statement of intent, not encryption. It discourages casual copying and misattribution, but someone determined can still edit the underlying PDF.
Because the watermark is composited onto the pages right here in your browser, the document you're labelling never gets uploaded, which is fitting, given that the files most in need of a CONFIDENTIAL stamp are exactly the ones you'd rather not send to a stranger's server first.
Frequently asked questions
Are my files uploaded?
No. The watermark is drawn in your browser; the file never leaves your device.
Can I control how visible the watermark is?
Yes. Adjust the opacity from faint (5%) to bold (80%) and set the font size to suit your page.
What layouts are available?
A tiled diagonal pattern that repeats across the whole page, or a single watermark centered on each page.
Is the watermark permanent?
It's drawn onto the pages as part of the document. It's meant as a visible label (like DRAFT or CONFIDENTIAL), not a security feature; a determined user could still edit the PDF.