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Mofumi PDF

Overlay PDF

Place one PDF on top of or behind another — letterheads, stamps, forms.

100% Private — files never leave your device
Upload PDFDrop files here or click to chooseAccepted: PDF Files never leave your device

About this tool

Overlay PDF combines two PDFs page on page. Put a letterhead behind a plain letter, lay a “COPY” stamp or a signature block over every page, or merge a filled-in layer with a blank form.

“Overlay” draws the second PDF on top; “Underlay” places it behind the existing content, which is what you want for letterheads and backgrounds. Choose how pages are matched: repeat the overlay pages in a cycle, use only the first or last overlay page, or match page 1 to page 1, page 2 to page 2.

Both documents stay vector — text remains sharp and searchable and the file stays small. Rotated pages are handled so the overlay always appears upright.

Engines: pdf-lib

How to use

  1. 1

    Upload the main PDF.

  2. 2

    Choose the overlay PDF, overlay or underlay, and how pages are matched.

  3. 3

    Click Overlay and download the combined PDF.

Use cases

  • Company letterhead

    Underlay a letterhead PDF behind letters exported from any program.

  • Stamps and marks

    Overlay an “APPROVED” or “CONFIDENTIAL” page on selected pages.

  • Pre-printed forms

    Combine typed data with the official form background.

Frequently asked questions

My underlay doesn't show — why?

If the main PDF has a solid white background (common in scans), it covers whatever is underneath. Use Overlay mode instead, ideally with a transparent overlay PDF.

What if the overlay page is a different size?

It is stretched to the size of each page it is placed on.

Can I use an image instead of a PDF?

Convert the image to PDF first with JPG to PDF, or use Add Watermark for logos.

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