Watermark a PDF Online — Free & Private
Stamp text like “CONFIDENTIAL” or “DRAFT” diagonally across every page of a PDF, right in your browser. Your file is never uploaded. No accounts, no limits.
🏷️ Add a watermark now →How to add a watermark to a PDF for free
- Open the Moriaki PDF watermark tool in your browser.
- Drag and drop your PDF.
- Type the watermark text you want to overlay on every page.
- Click Apply and download the watermarked PDF. Nothing is uploaded.
Why watermark PDFs with Moriaki?
Marking a document as confidential or draft often means it is sensitive in the first place — so uploading it to watermark it is counterproductive. Moriaki overlays the watermark locally in your browser, keeping the file on your device.
The semi-transparent text is drawn diagonally across each page so it is clearly visible without hiding your content — with no extra watermark of our own and no sign-up.
Frequently asked questions
Is adding a watermark free?
Yes — free, with no account, no limits, and no Moriaki branding added.
Is my file uploaded?
No. The watermark is applied entirely in your browser; your PDF never leaves your device.
Where does the watermark appear?
Diagonally across every page, semi-transparent, so it is visible without obscuring your text.
Can I choose the text?
Yes — enter any text you like, such as CONFIDENTIAL, DRAFT, or your company name.
Does it work on mobile?
Yes — in any modern browser, with no app to install.