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Drag and drop your PDF file or click to select it from your device. Your file stays in your browser — nothing is uploaded.
Enter your watermark text and adjust the opacity. The watermark will be applied diagonally across every page of your document.
Click "Apply" and download the PDF with your watermark. The original file remains unchanged.
Your files never leave your device. The watermark is applied in your browser using WebAssembly — no server uploads.
No registration, no file limits, no watermarks from us. Add your own watermarks to as many PDFs as you need.
The watermark is embedded directly into the PDF with a real font, ensuring it displays correctly on all readers and when printed.