PDF Overlay Tool
Overlay one PDF (like a letterhead, stamp or watermark) on the pages of another PDF. Everything happens in your browser — your files are never uploaded.
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Keep opacity low for a watermark (for example 20%). Use 100% for a letterhead.
How to use
- Choose the base PDF — this is your main document that gets the overlay.
- Choose the overlay PDF — the one with your letterhead, stamp or watermark.
- Set the opacity and size, then press the button.
- Your new PDF will be ready with the overlay on every page — download it.
Tip: If your overlay PDF has a white background, it will cover the page below. For better results, use a PDF with a transparent background.