Watermark PDF online
Stamp your custom text diagonally across every page of your PDF document. Processed instantly and securely in your browser.
Drop a PDF here to watermark, or browse
Processed locally in your browser. No files are uploaded.
How to watermark PDFs
Drag and drop the document you want to watermark. This is processed securely offline.
Enter the text (like CONFIDENTIAL or DRAFT) that you want stamped onto the document.
Click Apply Watermark to instantly stamp all pages and save the file.
Frequently asked questions
Upload your document, type your custom watermark text (e.g. "CONFIDENTIAL" or "DRAFT"), and click apply. The text will be stamped diagonally across every page of your PDF instantly.
Yes, our tool automatically applies a semitransparent styling with a 45-degree rotation so your underlying document remains perfectly readable while still displaying the watermark clearly.
Adding a custom watermark clearly identifies the document as your property, discouraging unauthorized sharing, printing, or copying. It is an essential step for protecting sensitive intellectual property.
Yes, 100% safe. This tool processes your files locally using WebAssembly. Your documents are never uploaded to our servers.