Free PDF Watermark Tool Online
Add a text watermark across every page of a PDF
Features
- Custom watermark text, color, opacity, and size
- Applied diagonally across every page
- Works on multi-page PDFs
- Runs entirely in your browser
Frequently Asked Questions
No — the watermark is added entirely in your browser using pdf-lib; your file never leaves your device.
Yes — set the text, color, opacity, and size before applying it, so it's visible without overwhelming the page content.
Yes, automatically — including multi-page PDFs, so you don't need to repeat the process page by page.
It's placed diagonally across the page at an opacity you control, so you can keep it visible but light enough not to obscure the text underneath.
No — this tool is meant for adding a permanent watermark; it doesn't include a way to remove one you've added.
Yes — since the watermark is layered on top of the page rather than editing the underlying content, it works on scanned or image-based PDFs too.
How to Use PDF Watermark
Using PDF Watermark is simple and free. No sign-up required.
- Upload your PDF.
- Enter watermark text and adjust color/opacity/size.
- Click Add Watermark and download.
About PDF Watermark
PDF Watermark stamps a custom text watermark diagonally across every page of a PDF — useful for marking a document as "Draft," "Confidential," or with your business name before sharing it, so copies can't easily be passed off as final or unattributed. You control the watermark text, color, opacity, and size, and it's applied consistently across every page, including multi-page documents. Everything runs entirely in your browser using pdf-lib, so the PDF is never uploaded to a server.
All iLoveToolZone tools work directly in your browser — no software installation or account required.