What is the difference between overlay and merge?

Merge appends pages sequentially (A pages then B pages). Overlay combines matching pages on top of each other so both appear on the same page.

Do both PDFs need to have the same number of pages?

The overlay is applied to matching page pairs. If one PDF has fewer pages, the remaining pages of the longer PDF are included unmodified.

Will transparent areas in the overlay show through?

Yes. Transparent backgrounds in the overlay PDF allow the base PDF content to show through, enabling clean template layering.

Can I control which PDF goes on top?

Yes. The tool lets you choose which PDF is the base layer and which is the overlay layer before processing.

Will the text in both PDFs remain selectable?

Text selectability depends on the PDF structure. Overlaid PDFs may reduce selectability in some viewers. Use the flattened output for archiving.

Does this work with scanned PDFs?

Yes. Scanned PDFs (image-based) can be overlaid just like standard PDFs since the process is page-level.

Is there a page count limit?

There is no hard limit, but very large PDFs may take longer to process in the browser.

PDF Overlay Online for Free | 1984PDF

Overlay one PDF on top of another. Use 1984PDF to pdf overlay online for free with secure browser-based processing and no signup.

PDF Overlay is a free online tool from 1984PDF. Process your files instantly in your browser with no installation, no signup, and no watermarks. Your files are processed locally and never uploaded to our servers, ensuring complete privacy and security.

How to PDF Overlay Online with 1984PDF

Upload your file to use PDF Overlay: Click the upload area or drag and drop your file to start using PDF Overlay.
Choose options and start PDF Overlay: Select the settings you need and click the button to begin processing with PDF Overlay.
Wait while processing completes: Your file is processed securely in the browser. Wait a moment for it to finish.
Review output quality and formatting: Check the result to make sure everything looks correct before downloading.
Download and share your final file: Click the download button to save your processed file to your device.

Frequently Asked Questions about PDF Overlay

What is the difference between overlay and merge?: Merge appends pages sequentially (A pages then B pages). Overlay combines matching pages on top of each other so both appear on the same page.
Do both PDFs need to have the same number of pages?: The overlay is applied to matching page pairs. If one PDF has fewer pages, the remaining pages of the longer PDF are included unmodified.
Will transparent areas in the overlay show through?: Yes. Transparent backgrounds in the overlay PDF allow the base PDF content to show through, enabling clean template layering.
Can I control which PDF goes on top?: Yes. The tool lets you choose which PDF is the base layer and which is the overlay layer before processing.
Will the text in both PDFs remain selectable?: Text selectability depends on the PDF structure. Overlaid PDFs may reduce selectability in some viewers. Use the flattened output for archiving.
Does this work with scanned PDFs?: Yes. Scanned PDFs (image-based) can be overlaid just like standard PDFs since the process is page-level.
Is there a page count limit?: There is no hard limit, but very large PDFs may take longer to process in the browser.

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