Watermark
Add image or text watermark to PDF.
How to Use Watermark
- Upload your file: Drag and drop your file into the active processing area above, or click the box to browse your device files.
- Configure settings: Select your preferred options (such as target file size in KB, compression level, page order, or output format).
- Process locally: Click the primary action button. Your file is rendered and encoded in seconds directly inside your browser memory.
- Download output: Click Download to save the modified document back to your device. No watermarks are added.
Zero-Cloud Privacy Guarantee
Unlike legacy web utilities that upload your sensitive documents to remote servers, PDFtiny executes 100% of processing inside your local browser using WebAssembly. Your files never leave your computer, ensuring complete privacy, enterprise compliance, and offline availability.
Technical Specifications
| Parameter | Specification |
|---|---|
| Processing Engine | Client-Side WebAssembly (WASM) & HTML5 File API |
| Server Transmission | 0 Bytes Uploaded (100% Local Browser Memory) |
| Device Compatibility | Chrome, Safari, Firefox, Edge, Android, iOS, Windows, Mac, Linux |
| Compliance | ISO 32000-2:2020, GDPR Article 25 (Privacy by Design) |
Frequently Asked Questions
Can I add both text and image/logo watermarks to a PDF?
Yes! You can choose between custom text stamps (like
Will the watermark be added to every page or only selected pages?
You can apply the watermark across all pages simultaneously or selectively choose page numbers and ranges (e.g., skip the cover page).
Can someone easily remove a watermark placed by PDFtiny?
Watermarks are embedded directly into the native vector content stream of the PDF pages, preventing casual removal in standard viewers.
Can I adjust transparency so underlying text remains readable?
Yes, an opacity slider (from 10% to 100%) lets you set subtle, translucent background watermarks that don\