Watermark a PDF
Drop a PDF and stamp a text watermark onto every page — set the text, placement, angle, opacity, and size, then download the result. Everything runs in your browser; your file never leaves your device.
About watermarking PDFs
A watermark is a faint label drawn over the content of every page — useful for marking a document as a draft, confidential, or a copy. This tool supports two kinds: a text watermark you type, or an image/logo watermark from a PNG or JPG you upload. Both use pdf-lib. You control the placement — whether it sits centered or tiles across the whole page — the angle, the opacity, and the size. Lower opacity keeps the underlying content readable. The watermark becomes part of the page content, so it shows up in every viewer.
Is it private?
Yes. The watermarking runs entirely in your browser using pdf-lib, a pure-JavaScript library. Nothing is uploaded, stored, or seen by us — there is no server involved.
Frequently asked questions
- How does the watermark get added?
- The text you type is stamped onto the pages of the PDF directly in your browser using pdf-lib, a pure-JavaScript library. By default it covers every page, or you can limit it to a page range like 1-3,5. You then download the watermarked file. There is no upload step.
- Is my file uploaded to a server?
- No. The watermarking runs entirely on your device, and the tool keeps working even if you go offline after the page loads. Your file is never sent anywhere, and there is no server involved.
- Can I add an image or logo watermark?
- Yes. Switch the watermark type to Image / logo and pick a PNG or JPG to stamp. The logo uses the same placement, angle, opacity, and page-range controls as the text watermark, and everything still runs in your browser.
- Is it free, and do I need an account?
- It is free with no daily caps and no sign-up. Drop a file, set the watermark text, and download the result.