Add a watermark to a PDF
Overlay a text watermark on every page with adjustable opacity and arbitrary rotation; the original content stays untouched.
Runs in your browserEvery computation happens in your browser — your data never leaves this device.
PDF (base64)
Result
The output is the base64 of the watermarked PDF.
Loading the PDF module…
Paste the PDF base64 to add a watermark
Pages: 0
What this tool does
- Mark internal documents as confidential.
- Flag a draft clearly.
- Add a signature line to a shared PDF.
Example
Input
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
Output
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
Empty watermark text is rejected; the angle may be any degree value, not just multiples of 90.
Frequently asked questions
Does the watermark cover the text?
It is drawn on top of the page content, with a default opacity of 0.2.
Can the watermark be Chinese?
No. The built-in font only covers Latin characters.
Can I watermark only some pages?
Currently every page is watermarked.
Keywords：pdfwasmofflinePDF 加水印