Stamp a watermark onto a PDF
Add a “DRAFT”, “CONFIDENTIAL” or branded mark to a PDF on your own device. Choose text or a logo, set how it sits, pick the pages, and download. Your file is never uploaded.
Stamp a mark, keep the file private
Add a status or ownership mark without trusting your document to a website. The stamp is applied in your browser with the pdf-lib engine — nothing about the file leaves your device.
Full control over placement
Choose a preset anchor, dial in any angle from 0 to 360° for a diagonal or flat mark, and set the opacity so the watermark reads clearly while the content stays legible underneath.
Your files never leave your browser
There's no upload. Everything happens on your device using WebAssembly — the bytes never travel to a server, so your documents stay yours. No ads, no third-party trackers, no accounts. We collect only an anonymous count of how often each tool is used. It's free, and it stays free.
How it works
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Drop in your PDF — Or click to choose one. It stays on your device.
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Compose the watermark — Enter text or choose a logo; set opacity, a preset placement and an angle.
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Pick pages and download — Stamp all pages or a range, then download.
Frequently asked questions
- Does adding a watermark change the pages’ content?
- No — the mark is drawn on top of the targeted pages; nothing else is altered and no pages are removed.
- Text or image — which can I add?
- Either. Use built-in fonts for a text mark, or upload a logo image to stamp instead.
- Are my files uploaded anywhere?
- No. Everything happens in your browser; files never leave your device.
- Is it really free?
- Yes — no account, no payment, no watermark on your output.