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Drag and drop your PDF file or click to select it from your device. Your file stays in your browser — nothing is uploaded.
Enter your watermark text and adjust the opacity. The watermark will be applied diagonally across every page of your document.
Click "Apply" and download the PDF with your watermark. The original file remains unchanged.
Your confidential documents never leave your device. The watermark is applied in your browser using WebAssembly — no server uploads, no risk of your sensitive files being stored on third-party servers.
No registration, no file limits, no watermarks from us. Add your own watermarks to as many PDFs as you need, completely free.
The watermark is embedded directly into the PDF content stream with a real font, ensuring it displays correctly on all PDF readers and appears on every printed copy.
Confidential documents — mark sensitive business proposals, financial reports, and legal contracts with "CONFIDENTIAL" to prevent unauthorized distribution and remind recipients of handling requirements
Draft marking — add "DRAFT" or "NOT FOR DISTRIBUTION" to working documents shared for review, preventing premature distribution of unfinished work
Brand protection — embed your company name or website URL as a watermark on published PDFs, whitepapers, and case studies to maintain brand attribution if files are re-shared
Copyright protection — add copyright notices to PDF portfolios, design documents, and creative work to assert ownership and deter unauthorized use
| Format | Description | Best For |
|---|---|---|
| Text watermark | Custom text overlay on every page | Branding, confidentiality, and draft marking |
| Adjustable opacity | Control watermark visibility | Subtle background marks or prominent overlays |
| Tiled or centered | Multiple layout options | Full-page coverage or single centered mark |
Use 25-40% opacity for a professional watermark that is clearly visible without obscuring the document content for normal reading
Keep watermark text short — 1-3 words (CONFIDENTIAL, DRAFT, SAMPLE) work best; longer text becomes hard to read at an angle
Use tiled mode to cover the entire page with repeating watermarks — this prevents removal by cropping a single central mark
Always keep the original unwatermarked file — watermarks are permanent and cannot be removed from the watermarked copy
FyleTools adds watermarks to your PDF entirely in your browser using WebAssembly and the lopdf library compiled from Rust. The watermark text is embedded directly into the PDF content stream with a real font, ensuring it displays correctly on all PDF readers. Your document never leaves your device.