Add Watermark
Stamp text diagonally across every page (e.g., CONFIDENTIAL).
Click to upload or drag & drop
Add your document. It will remain locally on your device.
Configuration
Stamp text across every page without a server round-trip
This tool draws custom text diagonally across every page of your PDF using pdf-lib's font and drawing APIs, directly in your browser. It's a fast way to mark drafts, confidential material, or ownership before sharing a document, without exposing that document to a third-party server first.
How it works
- 1
Upload the PDF you want to stamp.
- 2
Set the watermark text, opacity, and size.
- 3
Run the tool to download the watermarked file.
This tool never uploads your file. All processing happens locally in your browser using WebAssembly. Read more about how Foldr handles your data.
Frequently asked questions
Can I control how visible the watermark is?
Yes, an opacity slider from 10% to 90% controls how strongly the watermark text shows against the page content.
Is the watermark removable by the recipient?
The watermark is drawn as text directly onto the page content, similar to most simple watermarking tools. For tamper-resistant marking, a flattened image-based watermark is typically needed.