Watermark PDF
Add a text watermark to a PDF — adjust size, opacity, angle, and tile it across the whole page. Nothing is uploaded.
…
Runs entirely in your browser — your files never leave your device.
How to use
- Choose your PDFDrop in the document you want to mark.
- Type the watermarkEnter the text, then adjust size, opacity and tilt. Use unaccented characters — the built-in PDF fonts cover basic Latin only.
- Choose the coverageTick Tile to repeat it across the page, or leave it for a single mark in the centre. Limit it to certain pages if you wish.
- Download the marked filePress Add watermark. The mark is drawn into the page, so keep your original.
Why this runs in your browser
Every step happens locally using WebAssembly. Nothing is uploaded, so there is no queue, no size quota tied to a server, and no copy of your document sitting in someone else’s storage.
Frequently asked questions
Does the watermark support Vietnamese or other accents?
Not yet. The standard PDF fonts only cover basic Latin characters, so write the text without accents for now. The tool warns you before running rather than producing broken output.
Can the watermark be removed afterwards?
It is drawn into the page content, so it cannot be toggled off. Keep your original file if you may need a clean copy.
Can I watermark only some pages?
Yes, list the pages in the page field. Leave it empty to cover the whole document.