When this tool is useful
Combining letterhead with content, aligning a translated layer, or applying a repeated visual sheet after page pairing is reviewed.
How local processing works
The browser imports both documents, pairs pages by index or repeats the final overlay page, stretches each overlay across its base page, applies opacity, and writes a new PDF.
How to use it
- Prepare Overlay two PDFs: Work from a copy and confirm base/overlay file order, same-index or repeat-final pairing, page-size mismatch, and opacity. Keep the source unchanged.
- Apply Overlay two PDFs: Process locally in the browser. The browser imports both documents, pairs pages by index or repeats the final overlay page, stretches each overlay across its base page, applies opacity, and writes a new PDF.
- Download and verify: Save under a new name. Inspect every pairing at high zoom, confirm no unexpected clipping, and test text, links, forms, and print output that must survive.
Important limitations
Overlay is visual composition, not semantic merging; mismatched page sizes, transparency, forms, links, annotations, and signatures need review.
Verify the downloaded result
Inspect every pairing at high zoom, confirm no unexpected clipping, and test text, links, forms, and print output that must survive.
Private by design
Your files stay in this browser. The tool does not upload the source or output to our servers.
Questions and answers
When should I use Overlay two PDFs?
Combining letterhead with content, aligning a translated layer, or applying a repeated visual sheet after page pairing is reviewed.
What does Overlay two PDFs change?
The browser imports both documents, pairs pages by index or repeats the final overlay page, stretches each overlay across its base page, applies opacity, and writes a new PDF.
Which limits and settings matter?
base/overlay file order, same-index or repeat-final pairing, page-size mismatch, and opacity. Overlay is visual composition, not semantic merging; mismatched page sizes, transparency, forms, links, annotations, and signatures need review.
How do I verify the result?
Inspect every pairing at high zoom, confirm no unexpected clipping, and test text, links, forms, and print output that must survive.