PDF Overlay
Overlay one PDF on another with transparency and positioning control.
Use cases:
- Place content on letterhead
- Fill forms
- Apply watermarks
- Compare two documents
How to Overlay PDF Files Online
Select the base PDF whose pages you want to keep.
Select the PDF to place on top of the base pages.
Choose opacity and a center or corner position. Enable fit-to-page scaling if needed.
Click Overlay PDFs to download the result. Overlay pages repeat when the base PDF has more pages.
Why Overlay PDFs with SonuPDF?
Opacity control
Set the overlay opacity from 10% to 100%.
Page alignment
Place the overlay in the center or a corner. Fit it proportionally inside each base page, or use its original size.
Repeating overlays
A one-page overlay repeats on every base page. Multi-page overlays cycle in order.
Browser processing
PDF processing happens on your device without uploading the documents to a server.
Frequently Asked Questions
Overlay places one page on top of another. Merge adds pages one after another. Use overlay for letterheads, templates and watermarks.
Yes. Enable scaling to fit the overlay proportionally inside the base page. Choose the center or a corner for alignment.
The output keeps the base PDF page count. Overlay pages cycle in order until every base page has an overlay.
The previews show the two original documents separately. Open the downloaded PDF to check the combined result.
No. The overlay operation processes both documents in your browser.