Add a text watermark to every page of your PDF. Adjust opacity, position and rotation. No file is sent to a server.
Add a text or image watermark to every page of your PDF, confidential, draft, or custom branding, using pdf-lib. It suits sensitive contracts, internal documents, or personal files.
Choose your watermark text, opacity, rotation angle, and position, then download the stamped PDF instantly. The watermark is added as an overlay, so the existing text layer and hyperlinks stay intact and the original file is left unchanged.
No. Your PDF is parsed and rewritten by pdf-lib in your browser tab, the document is loaded into memory on your own device, the watermark text or image is drawn over each page there, and the new PDF is serialised in memory and offered as a local download. Nothing reaches Sunasty or any third party. Open your browser's DevTools, go to the Network tab and watch: no request carries your file.
Yes. You can upload a PNG or JPG image (it stays local too) and stamp it onto every page at a chosen opacity and position.
The existing content layer is preserved. The watermark is added as an overlay; your original text and links remain intact.
Yes, once the page has loaded. Because the processing happens on your device, you can disconnect from the network and the tool keeps working. This is the clearest proof that your data never leaves your machine.
It is completely free and requires no sign-up. There are no watermarks, no daily limits and no tracking cookies needed to use the tool.