PDF overlay
Stamp a PDF (letterhead or seal) over every page of another file.
Base file
Supported formats: PDF
Overlay file (letterhead/stamp)
Supported formats: PDF
All processing happens directly in your browser. Your files are never uploaded to any server and no one else can see them.
How to use
- 1
Upload the base file.
- 2
Upload the overlay file (letterhead or stamp).
- 3
Click "Convert" and download the combined file.
About the PDF overlay tool
Sometimes you want to place one full PDF design over another: an official company letterhead on a text document, a pre-designed "Approved" seal on a contract, or a unified background on a deck. This tool takes two files — a base and an overlay — and stamps the overlay over every page of the base while keeping both files' content.
If the overlay is a single page it applies to every base page (letterhead style); a multi-page overlay is matched page by page. You also control the overlay's opacity so content behind it shows through. Both files are processed in your browser with no upload — which matters for official stamped documents.
When do you need this tool?
Adding an official letterhead
Place your company's designed PDF letterhead over every page of a letter or report before sending it.
Stamping approved documents
Overlay a pre-designed "Approved" seal or authority logo onto contracts and certificates.
A unified background or frame
Add a unified frame or design background across every page of a deck or booklet.
Why ToolsRio?
Real privacy
All processing happens inside your browser. Your files are never uploaded to any server, and nobody can see them — not even us.
Free without limits
No watermark, no file-count limits, and no hidden paid tiers.
Instant speed
No waiting for uploads and downloads to a remote server — processing starts immediately on your device.
No sign-up
No account, no email, no annoying ads. Open the tool and use it right away.
Frequently asked questions
What if the overlay file is a single page?+
A single overlay page is applied to every page of the base file — perfect for adding a unified letterhead across a whole document.
How is this different from the watermark tool?+
The watermark tool adds text, while this overlays a full PDF file with its design on top of the base file — better for pre-designed letterheads and seals.