PDF Tools
Watermark PDF — Add Text Watermark Without Uploading
🔒 Runs in your browser
Stamp a diagonal text watermark — like "CONFIDENTIAL" or "DRAFT" — across every page of a PDF. Processing happens entirely in your browser, so the document never leaves your device and no account is required.
How to use this tool
- Select your PDF file.
- Enter your watermark text and adjust opacity.
- Download the watermarked PDF.
Drop a PDF to watermark
Your files never leave your browser. How it works
Frequently Asked Questions
- Are my files uploaded?
- No. The watermark is applied in your browser with pdf-lib. Your file never leaves your device.
- Can I change the watermark opacity or angle?
- The watermark is rendered at 30% opacity and a 30° diagonal — a readable but non-obstructive default. Custom styling is on the roadmap.
- Can I use an image watermark?
- Not yet — this tool applies a text watermark. Image watermarks are planned.
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How to Watermark a PDF Without Uploading It
Add a text watermark — CONFIDENTIAL, DRAFT, or custom — to every PDF page in your browser. pdf-lib embeds the watermark in the content stream; no server upload required.