# Watermark PDF Online

> Watermark PDF online for free — add diagonal text across every page. Private, no signup. Your export has no site watermark.

Canonical: https://mypdf.space/tools/watermark
Last updated: 2026-10-26

## 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.

## About this tool

Add a diagonal text watermark across every page.

Add a diagonal text watermark across every page — free, private, no upload.

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

1. Open your PDF.
2. Enter watermark text and options.
3. Add and download.

## What you need

- One PDF
- Watermark text

## Notes

- Draws a diagonal text overlay on each page.

## 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.

## FAQ

### 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.

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