Free online PDF tool
Overlay one PDF over another directly in your browser
Overlay or merge one PDF on top of another — layer a watermark document, a form template, a translated page, or a corrected version over the original. PdfWiseAI places each page of the overlay PDF onto the corresponding page of the base document with adjustable opacity.
Use PDF OverlayHow it helps
A straightforward way to work with your document
The overlay runs entirely in your browser. You can limit the overlay to the first N pages of the base document. If the overlay has fewer pages than the base, the last overlay page is repeated. The result is a single PDF with the overlay content composited onto the base pages.
Both PDFs stay on your device. No server upload, no sign-up and no data is retained by PdfWiseAI.
Three simple steps
How to use PDF Overlay
- 1
Select the base PDF (bottom layer).
- 2
Select the overlay PDF (top layer).
- 3
Optionally adjust the number of pages to overlay and opacity.
- 4
Download the combined PDF.
Professional use cases
When a private browser-based workflow helps
This workflow is useful for legal teams assembling exhibits, finance staff preparing statements or tax records, healthcare offices organizing administrative documents, and anyone handling files that should not be copied to an unnecessary conversion server.
PdfWiseAI creates a separate result and leaves the source unchanged. Review page order, image quality, visible content and the output filename before sharing the generated file.
Privacy verification checklist
Check the workflow before using sensitive documents
- Use a harmless sample file first and confirm the expected output.
- Prefer local transformations when no AI analysis is needed.
- Follow your organization’s security, legal and records policies.
- Keep originals until the generated file has been reviewed.
Local processing reduces document transfer, but it is not a certification of compliance with HIPAA, attorney-client duties or another regulatory framework.
Frequently asked questions
PDF Overlay FAQ
What is overlay useful for?
Watermarking, form template layering, translating page content, or merging corrected pages onto originals.
Are the PDFs uploaded?
No. The overlay runs entirely in your browser.
Can I control the opacity?
Yes. Choose 20 %, 50 %, 80 % or 100 % opacity for the overlay layer.
What is the difference between overlay and merge?
Merge stacks pages end to end. Overlay composites each page of the overlay PDF on top of the matching page of the base PDF, producing a single layered document. Overlay is useful for watermarking, template application, and stamped versions of originals.
Can I overlay only a few pages?
Yes. Set the number of pages to overlay. If the overlay has fewer pages than the base, the last overlay page is repeated for the remaining base pages.