Watermark PDF Without Uploading — Free Batch Tool
Adding a watermark to a PDF to mark it as confidential or draft is a routine document task. This tool stamps a diagonal text watermark on every page using pdf-lib running in your browser. Because no server is involved, confidential documents stay private throughout the process.
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Watermarking uses pdf-lib in your browser — your document is never uploaded to any server.
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Watermark PDF →
Free · No upload · No account required
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Frequently Asked Questions
- Can I customize the watermark text?
- Yes. You can enter any watermark text such as "CONFIDENTIAL", "DRAFT", or a custom label.
- Can I change the watermark opacity?
- The watermark is applied at a standard semi-transparent opacity. Custom opacity settings are not currently available.
- Does watermarking prevent copying or editing?
- A text watermark is a visual marking only. It does not apply encryption or editing restrictions. Use PDF Protect to add a password for access control.