Quick Answer
A PDF watermark tool stamps text over your pages so everyone knows what the document is: CONFIDENTIAL, DRAFT, FOR REVIEW. This one adds a semi-transparent text watermark in a diagonal pattern or centered, with full control over size, opacity and which pages it appears on.
What This Tool Does
Type the watermark text, choose a size and opacity, pick diagonal or centered placement, and decide whether it applies to every page or just specific ones. The result is a new PDF with the watermark drawn over the original content — your source file is never modified.
Key Features
- Text watermark — any text you type, tiled diagonally or centered.
- Opacity control — from subtle 10% to strong 50%.
- Size control — small to extra-large text.
- Page selection — all pages or specific ones (e.g.
1-3, 5). - Original untouched — you always download a new file.
How to Use the Watermark Tool
- Add your PDF.
- Type the watermark text, e.g. CONFIDENTIAL.
- Set size, opacity and angle.
- Choose All pages or Specific pages (and enter the range).
- Click Add Watermark and download.
Examples
An agency shares a proposal draft with DRAFT — NOT FOR DISTRIBUTION tiled across every page so a leaked copy is instantly identifiable. A recruiter stamps only page 1 of a rate card with CONFIDENTIAL before sending it to a client.
Tips
- 10–20% opacity keeps the document readable while making the label clear.
- Watermarks discourage casual copying but are not encryption — use Protect PDF to lock the file.
- Latin text renders in the built-in Helvetica font; special glyphs may not display.
Privacy
Watermarking runs locally with pdf-lib. Nothing is uploaded.
Conclusion
Label your documents in seconds and share with confidence — free and private.