# Add Watermark to PDF

> Add text or image watermarks to PDF pages. Customize opacity, position, rotation, and size.

Live tool: https://lofttools.com/tools/pdf-tools/watermark-pdf

Category: PDF & Documents

## How it works

1. **Select PDF** — Drop the PDF you want to watermark, or click to choose one
2. **Configure watermark** — Enter text or select an image, then set opacity, position, and rotation
3. **Download** — Download your watermarked PDF instantly

## FAQ

### Can I watermark only specific pages?

Yes. After uploading, use the page picker to choose "all pages", "first page only", "last page only", or a custom range like "2-5, 10". Each selected page gets the same watermark.

### Does the watermark sit above or behind the existing content?

Both are supported. Use "overlay" (default) for a visible stamp that sits on top of the page content, or "background" to place it behind so text reads cleanly over it. Overlay with low opacity (20-40%) is the most common choice for "DRAFT" or "CONFIDENTIAL" stamps.

### Can I use a transparent PNG as the watermark image?

Yes. PNG transparency is preserved. For logo watermarks, a transparent-background PNG at 30-50% opacity is the standard pattern. The opacity slider multiplies the image's own alpha channel.

## Privacy — what we do not do

This tool runs entirely in the browser via WebAssembly. Your file never reaches a Loft Tools server. Specifically:

- **No upload.** The file bytes load into the browser tab's memory and process on your own CPU. Open DevTools → Network and observe zero outbound requests carrying file data while Add Watermark to PDF runs.
- **No AI training on your file.** Loft does not train models. We could not train on a file we cannot see.
- **No content scanning.** No virus, copyright, or content-moderation pass against your file. The bytes are not accessible to us.
- **No server-side log of file contents, filenames, or EXIF metadata.** Cloudflare edge captures URL and truncated IP for abuse defense (standard CDN behaviour). Cloudflare Web Analytics records anonymous page hits, no cookies, no PII. Nothing about your file content reaches any log.
- **No retention.** Close the tab and the file leaves browser memory. No backups exist on our side because no copy ever existed on our side.
- **No account.** No email, no signup, no auth, no telemetry tied to you.
- **Offline-capable after first visit** (PWA). Once you've loaded a tool, it caches; later sessions work without internet. For high-sensitivity files, run the tool once online to warm the cache, then disconnect before processing.

Compare with upload-based services: each transmits your file to a processing server. Even over HTTPS, each has logs, retention windows, and subpoena exposure. Loft has none of these because the server architecture does not include your file.

## More

- All tools: https://lofttools.com/tools
- Category: https://lofttools.com/tools/pdf-tools
- LLM index: https://lofttools.com/llms.txt