PDF Overlay

Stamp one PDF on top of another as a foreground or background layer. Perfect for letterheads, logos, and certificate templates. 100% in your browser — your files never leave your device.

No signupNo file uploadsUnlimited use
Stays on your device

PDF files

  • Never uploaded — overlaying happens in your browser
  • No sign-up, no watermark, no file limit

PDF overlay, free and online: open your main PDF here, add the PDF to stamp onto it — a letterhead, a logo page, a watermark or a template — choose Background (behind the page content) or Foreground (on top), set the opacity, check the page-1 preview and click Apply Overlay & Download. Both files are combined in your browser, so neither is uploaded, and there is no sign-up or limit. Each overlay page is stretched to fill the page, so make it the same size as your document; a one-page overlay repeats on every page unless you turn Repeat overlay off. Password-protected PDFs can't be used.

How it works

How to Overlay Two PDFs in 3 Steps

Three steps. Add your overlay PDF, choose a layer position and opacity, preview the result, and download — all in your browser.

  1. Step 1: Upload Your PDFs

    Upload your base PDF — the document you want to overlay onto — then add your overlay PDF, the letterhead, logo, watermark, or template you want to apply. Both files are read entirely within your browser and are never transmitted to any external server. File size is limited only by your device's available browser memory.

  2. Step 2: Choose Layer Position and Set Opacity

    Choose Background (behind the base content — ideal for letterheads and borders) or Foreground (on top of it — ideal for watermarks and stamps), and set the opacity from 0 to 100%. If your overlay PDF has fewer pages than your base document, keep Repeat overlay on so its last page is stamped on the remaining pages. Each overlay page is stretched to fill the page, so use the same page size for both. A live page-1 preview shows the result before you download.

  3. Step 3: Download Your Overlaid PDF

    Click Apply Overlay & Download. Both documents are composited entirely inside your browser, so no files are stored on any server. The output is a single PDF with the overlay applied — the page count matches your base document — ready to share, send, or archive.

Everything You Need to Overlay PDFs

Foreground and background layers, opacity control, and an automatic repeat option — all running entirely in your browser, with your files staying on your device.

Foreground and background layers

Choose whether the overlay sits on top of your base content (foreground) or behind it (background). Letterheads and logos usually work best as background layers — they appear on the page without obscuring the document text. Watermarks and approval stamps often work better as foreground layers. The tool defaults to background and switches with one click.

Opacity control

Adjust how transparent or solid the overlay appears with a 0–100% slider. Set a low opacity for a subtle watermark effect, a medium opacity for a branded letterhead that stays readable, or full opacity for a solid stamp. The opacity applies to the overlay layer only, so your base content is never dimmed.

Repeat overlay across pages

If your overlay PDF is a single page — a letterhead template, for example — but your base document has many pages, the repeat option applies the last overlay page to every remaining base page automatically. Leave it on to brand an entire report in one step, or switch it off for strict page-by-page matching.

Live page-1 preview

Before you download anything, a live preview composites page 1 of both PDFs at your chosen layer position and opacity. Confirm the overlay lands where you expect and is as subtle or solid as you want, then download — no guesswork.

100% browser-based processing

Both PDFs are processed locally inside your browser using client-side computation. Nothing is uploaded to any external server at any point — which is critical for documents that may contain confidential information such as internal reports, client contracts, patient records, or financial statements.

No account, no limits

Open the tool and start working immediately. No sign-up, no email confirmation and no usage caps. Process as many overlaid PDFs as you need, with file size bounded only by your device's available browser memory.

Why Use OneClickPDF to Overlay PDFs?

Privacy-first by design. Many online PDF tools process your files on their servers. OneClickPDF never uploads anything. Both the base document and the overlay PDF are composited inside your browser using client-side PDF processing, so no third party ever sees your document — which matters when you are branding contracts, financial reports, medical records, or anything confidential.

Opacity control. A 0–100% opacity slider lets you dial in a faint watermark, a readable branded letterhead, or a solid stamp.

See the result before you download. The live page-1 preview composites your two PDFs at the chosen layer position and opacity. You are not guessing — switch foreground to background or nudge the opacity and the preview updates instantly.

Truly free, with no hidden limits. There is no daily cap, no hourly restriction, no file count limit, and no watermark added by us. Overlay as many PDFs as you need, at any time, for free.

Common Uses for PDF Overlay

  • Adding a company letterhead as a background layer across an entire report, proposal, or contract — the letterhead appears on every page without changing the original content
  • Certificate templates — overlay a decorative border or official seal template over a blank or pre-filled certificate PDF, adjusting layer position and opacity as needed
  • Watermarking documents — stamp Confidential, Draft, or For Review across every page using a foreground layer at reduced opacity, so the watermark stays visible without obscuring the text
  • Adding logos to existing PDFs — position your logo within a full-page overlay PDF, then stamp it onto invoices, order confirmations, or reports without recreating the document
  • Approval and signature stamps — overlay official approval stamps or date stamps over finalized documents as a foreground layer before archiving or distributing
  • Designing a single-page brand template and applying it as a background across every page to keep internal and external reports visually consistent — then add a text watermark if you need one

Why choose ours?

Private, instant, unlimited

Most competitors either don't offer PDF overlay or upload your files to their servers. We process everything in your browser.

FeatureOursSejdaiLovePDFSmallPDFPDF24Adobe
PDF-on-PDF overlayPaid
Free & unlimited———$23/mo
No account needed———
Files stay in browser———
Foreground & background———
Opacity control———
Auto-repeat overlay———
No file size limit———500MB

Competitor information was accurate at time of publication and may have changed.

Finished overlaying? add a text watermark stamp a custom text mark across every page, or merge, compress, or sign your PDF. All tools run in your browser, no account required.

Frequently Asked Questions

What is a PDF overlay?
A PDF overlay stamps one PDF onto another so both show on the same pages — for example a letterhead behind a letter, or a DRAFT stamp on top of a report. The result is one PDF with the same pages as your main document.
How do I overlay two PDFs online for free?
Open your main PDF on this page, add the overlay PDF, choose Background or Foreground, set the opacity and click Apply Overlay & Download. It is free with no sign-up, and both files are combined in your browser, so neither is uploaded.
What is the difference between a foreground and a background overlay?
Background puts the overlay behind the page's own content — best for letterheads, borders and page backgrounds. Foreground puts it on top — best for stamps and watermarks, usually at a lower opacity. The tool starts on Background.
What does the opacity setting do?
It sets how strongly the overlay shows, from 0% (hidden) to 100% (solid) in 5% steps; it starts at 100%. Only the overlay changes — your main document is never dimmed.
What does Repeat overlay do?
When the overlay PDF has fewer pages than your document, its last page is repeated on every remaining page, so a one-page letterhead lands on all of them. Switch it off to match pages one to one: overlay page 1 on page 1, page 2 on page 2, and any extra pages left as they are.
What if the two PDFs have different page sizes?
Each overlay page is stretched to fill the whole page it lands on, so an overlay of a different size or shape comes out distorted. Make the overlay PDF the same page size as your document — both A4, for example.
Can I add a letterhead to every page of my PDF?
Yes. Save the letterhead as a one-page PDF the same size as your document, add it as the overlay, choose Background and keep Repeat overlay on; every page gets the letterhead.
Can I use PDF overlay to add a logo or image watermark?
Yes. Put the logo where you want it on a one-page PDF with nothing else on the page, add it as a Foreground overlay at a lower opacity, and keep Repeat overlay on. For a text-only watermark, Add Watermark (oneclickpdf.net/tools/watermark) is quicker.
Is overlaying PDFs the same as merging them?
No. Merging puts one PDF's pages after another's and makes a longer file; an overlay puts one PDF on top of another, so the page count stays the same.
Does the text in my PDF stay selectable?
Yes. Nothing is turned into an image: your document's text, links and form fields stay as they were, and the overlay page is added as page content, not as a picture of it.
Are my files uploaded when I overlay PDFs?
No. Both PDFs are read and combined by your browser on your own device and are never sent to our server or anyone else's, so they are safe to use for confidential documents.

Guides & tutorials

How to Overlay One PDF on Top of Another

Stamp one PDF on top of another as a foreground or background layer. Add letterheads, stamps, and templates — free and private 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.

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