How to Overlay One PDF on Top of Another

Last updated: February 24, 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

Open the PDF Overlay tool

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

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.

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).

Configure overlay options

Choose how the overlay maps to pages: first page only, all pages, or cycle through overlay pages. Adjust opacity if you want the overlay to be semi-transparent.

Preview and download

A live preview shows the combined result. When satisfied, click Apply & 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. Choose 'First page only' to apply the overlay to just page 1 of the base document. This is common for letterheads that only appear on the first page.

What if the overlay has multiple pages?

The overlay cycles through its pages. If your overlay has 2 pages and the base has 6 pages, the overlay alternates: page 1, page 2, page 1, page 2, etc. This is useful for alternating odd/even letterhead designs.

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

How to Add a Watermark to a PDF

Add text watermarks to PDF documents for free. Choose position, opacity, rotation, size, and color — with live preview. 100% in your browser.

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.