Short answer
Watermark runs entirely in your browser. Add a diagonal text watermark across every page. No account, no watermark, and the file never leaves your device.
Stays on your device·No upload·No account·No watermark·Offline after install·How it worksMethodologyPrivacy
Watermark PDF Online
Add a diagonal text watermark across every page — free, private, no upload.
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About this tool
Watermark PDF online for free — add a diagonal text mark across every page when you need a draft, confidential, or ownership stamp. Enter the text and options, then download.
The overlay is drawn locally — useful before Confidential Send or email. mypdf never adds its own watermark.
How to use Watermark PDF Online
- 1Open your PDF.
- 2Enter watermark text and options.
- 3Add and download.
You need
- One PDF
- Watermark text
Common use cases
- Stamp DRAFT or CONFIDENTIAL before sharing a review copy.
- Mark ownership on samples sent to clients.
- Label pages before Confidential Send or email.
Frequently asked questions
Can I customize the watermark text?
Yes. Enter your text and options, then add and download.Does watermarking upload my file?
No. The overlay is drawn in your browser.Will mypdf add its own watermark?
No. The only watermark in the export is the text you choose.