How to Overlay One PDF on Top of Another

Last updated: October 23, 2026

Need to add a company letterhead behind every page, stamp a 'DRAFT' watermark PDF over a document, or combine a form template with filled content? PDF overlay places one document on top of another — either as a foreground stamp or a background layer. OneClickPDF does this entirely in your browser.

Step-by-Step Guide

1

Open the PDF Overlay tool

Navigate to the PDF Overlay page on OneClickPDF. No account needed.

2

Upload both PDF files

Upload your base document (the main content) and the overlay document (the stamp, letterhead, or template). Both load in your browser.

3

Choose foreground or background

Select Foreground to stamp the overlay on top of the base (good for stamps and watermarks). Select Background to place it behind (good for letterheads and templates).

4

Configure overlay options

Overlay pages are matched to your pages one to one. Keep 'Repeat overlay' on to repeat the overlay's last page on the remaining pages, or switch it off to leave them as they are. Adjust opacity if you want the overlay to be semi-transparent.

5

Preview and download

A live preview shows the combined first page. When satisfied, click Apply Overlay & Download to get your overlaid PDF.

PDF Overlay

Stamp one PDF on top of another as a background or foreground.

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Frequently Asked Questions

What's the difference between foreground and background?
Foreground places the overlay on top of the base content — good for stamps, watermarks, and 'APPROVED' marks. Background places it behind — good for letterheads, colored backgrounds, and form templates.
Can I overlay just the first page?
Yes. Use a one-page overlay and switch 'Repeat overlay' off; only page 1 of the base document gets it. This is common for letterheads that only appear on the first page.
What if the overlay has multiple pages?
Pages are matched one to one: overlay page 1 on page 1, page 2 on page 2, and so on. If the overlay is shorter, its last page is repeated on the remaining pages with 'Repeat overlay' on, or they are left as they are with it off. It does not cycle back to the first overlay page.
Can I adjust the transparency?
Yes. The opacity slider lets you make the overlay semi-transparent, which is useful for subtle watermarks or background designs that shouldn't overpower the main content.

PDF overlay is the right tool for letterheads, stamps, form templates, and any situation where you need to combine two PDF layers. All processing happens in your browser — your documents never leave your device.

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Related Guides

Add a Company Letterhead or Background to a PDF

Place your company letterhead behind every page of a PDF. Use PDF overlay to add branded backgrounds to any document — free in your browser.