Add a text or image watermark to your PDF documents online for free. Protect your work and brand your documents.
Our watermark tool lets you add custom text (like 'CONFIDENTIAL', 'DRAFT', or your company name) or a logo image as a watermark to every page of your PDF.
Control the watermark opacity, size, angle, and position. The watermark is permanently embedded, making it ideal for protecting intellectual property and branding.
Select or drag your PDF file to begin adding a watermark.
Enter your watermark text or upload an image. Set opacity, angle, and position.
Download your PDF with the watermark applied to all pages.
Your files never leave your device. Everything runs directly in your browser using JavaScript — no server, no cloud, no data collection. Your documents stay private.
Yes, you can upload a PNG or JPG image to use as a watermark.
Our watermarks are embedded into the PDF content layer, making them very difficult to remove.
Yes, you can set opacity from 10% (very faint) to 100% (fully opaque).
By default, yes. You can also choose to apply it to specific pages only.
Yes — PDFInOne is a completely free alternative to iLovePDF, Smallpdf, PDF24, and Adobe Acrobat online. Unlike those services, PDFInOne processes everything locally in your browser: no file uploads, no account required, no file size limits, and no watermarks.