A watermark does quiet but important work: it labels a document as Draft, Confidential or Sample, brands every page with your name, and discourages people from passing your work off as their own. The Watermark PDF tool layers diagonal text across each page of your file at an opacity you control, so the message is unmistakable while the underlying content stays perfectly readable.
How to use the Watermark PDF tool
- Upload your PDF.
- Type the watermark text you want repeated on every page.
- Set the font size and the opacity (how faint or bold the mark appears).
- Click Apply watermark and download the protected file.
Where watermarks earn their keep
Creators stamp "Preview" or "Sample" across portfolios so the full-quality version stays valuable. Businesses mark internal documents "Confidential" to remind everyone who handles them to be careful. Authors and photographers protect drafts and proofs before they are shown to clients. A diagonal, semi-transparent label is hard to crop out and instantly communicates the document's status the moment anyone opens it.
Tips for an effective watermark
- Keep opacity low (around 15–25%) so the words underneath remain easy to read.
- Use short, clear text like CONFIDENTIAL or your domain name for maximum impact.
- Scale the size to the page; a larger mark is harder to remove but should not overwhelm the content.
- Apply it last, after the document is otherwise final.
The watermark is rendered as part of each page, so it travels with the file wherever it goes. Everything is processed in your browser, which makes this an ideal way to mark sensitive drafts privately before they ever circulate.
Quick reference
| Property | Detail |
|---|---|
| Input | One PDF + watermark text |
| Style | Diagonal, adjustable opacity |
| Scope | All pages |
| Readability | Content stays visible |
| Upload | None |