Watermark a PDF without uploading it.
Stamp CONFIDENTIAL, DRAFT, or any custom text on every page of a PDF. Control size, opacity, angle, and placement, all in your browser with nothing uploaded.
A document you're watermarking is a document you care about.
Adding a watermark is a signal. It says this document is confidential, or a draft, or not for distribution. Uploading that document to a third party to apply the stamp is a contradiction: you're protecting it by giving it to a stranger first.
If you're stamping a document CONFIDENTIAL, the last thing you should do is upload it to a server to add the watermark.
KeptPDF applies watermarks entirely in your browser. Your document never touches a server. The stamp is baked directly into the PDF locally. Check the Network tab yourself while watermarking and your document never appears in a request.
How to watermark a PDF
Three steps, on your device. No account needed, and nothing gets uploaded.
1. Open your PDF
Drop the file onto the page. It loads in your browser without being sent anywhere.
2. Configure the watermark
Type your text (CONFIDENTIAL, DRAFT, your company name), adjust the opacity, choose the angle, and set the position on the page.
3. Download the watermarked PDF
Every page carries the stamp. Save the copy to share.
Your stamp. Your document. Never uploaded.
Custom text
Type any watermark text: CONFIDENTIAL, DRAFT, FOR REVIEW, your organization name, or anything else. Adjust font size to fit.
Opacity and angle control
Dial in a subtle diagonal watermark or a bold centered stamp. Adjust opacity so the watermark is visible without obscuring the content.
Stamps every page
The watermark is applied to all pages in one step. No need to repeat per-page.
No upload or account needed
Watermark free with no account, no daily limit. Pro ($29/month) supports larger files (hundreds of MB practical limit, browser memory dependent).