Overlay One PDF on Top of Another
Need to apply letterhead to existing documents, add a watermark to every page, or overlay a form template onto filled content? Overlay places one PDF's content on top of another, blending both layers into a single document. Each page from the overlay PDF is combined with the corresponding page from the base PDF.
How to Overlay One PDF on Top of Another
- 1Identify your base and overlay files
The base PDF is the main document (like a contract or report). The overlay PDF contains the content you want to superimpose (like letterhead, a watermark, or a form template). The overlay should have the same number of pages as the base, or it will repeat or truncate.
- 2Load both PDFs into the overlay tool
Drop the base PDF first, then the overlay PDF. The tool shows side-by-side previews so you can verify alignment. Both files stay in your browser.
- 3Configure overlay settings
Set the overlay opacity (100% for opaque letterhead, 20-40% for watermarks). Choose whether the overlay applies to all pages or specific page ranges. Adjust positioning if the overlay doesn't perfectly align with the base content.
- 4Apply the overlay
Click apply. The tool composites the two PDFs page by page. The result is a single PDF with the base content and overlay content merged on each page. Download the overlaid document. Verify alignment and opacity are correct.
Overlay PDFs now
Combine two PDFs into one. Perfect for letterhead and watermarks. Done in your browser.
Overlay PDFFrequently Asked Questions
What happens if the base and overlay PDFs have different page counts?
The tool matches pages in sequence. If the overlay has fewer pages, it repeats from the beginning. If the base has fewer, excess overlay pages are ignored. For best results, both files should have the same number of pages.
Can I overlay a logo onto existing PDF pages?
Yes. Create a PDF containing just your logo at the desired position, then use it as the overlay. Set opacity to 100% for a solid logo or lower for a watermark effect. The logo PDF should be a single page — it will repeat across all base PDF pages.
Does overlay work with scanned PDFs?
Yes, because overlay processes at the page level. Both base and overlay can be scanned or image-based PDFs. The results are composited page images. Alignment precision depends on matching page dimensions between the two files.
Does overlaying increase file size significantly?
The output file combines content from both inputs. Expect the file size to be roughly the sum of base plus overlay. Using a simple overlay (like a small logo or text) adds minimal size. Full-page overlays like letterhead will add more.
Your documents stay on your device
PDF overlay processes both files entirely in your browser. The base document and overlay content never leave your device during processing.