How to Overlay PDF Documents: Combine Two PDF Files on the Same Pages
Need to stamp a letterhead over a document, or merge a watermark layer with your content? Learn how to overlay one PDF on top of another.
Merging PDF Files puts documents back-to-back page 1 of File A, page 2 of File A, then page 1 of File B. But what if you need to put File B on top of File A, so both appear on the same pages?
This is called PDF Overlay, and it is essential for:
- Adding a company letterhead to an existing document
- Stamping a "DRAFT" or "APPROVED" template across every page
- Combining a transparent logo layer with a report
- Merging a form template with filled-in data
Our free PDF Overlay tool places one PDF document directly on top of another, combining both into a single unified file.
Overlay vs. Merge: What Is the Difference?
| Operation | What Happens | Result |
|---|---|---|
| Merge | Files are placed back-to-back | 5-page doc + 5-page doc = 10-page doc |
| Overlay | Files are stacked on the same pages | 5-page doc + 5-page doc = 5-page doc (combined) |
With an overlay, the content of both files appears on each page like printing on both sides of a transparency sheet and stacking them.
Common Overlay Scenarios
1. Letterhead Templates
You have a blank PDF with your company's letterhead (logo, address, borders). You want to apply it to a plain document so it looks like it was printed on official stationery. Overlay the letterhead template on top of your content.
2. Approval Stamps
You have a single-page PDF with a large "APPROVED" or "CONFIDENTIAL" stamp. Overlay it on every page of the target document to mark it as reviewed.
3. Form Backgrounds
You have a form template (the blank form with labels and lines) and a data layer (the filled-in responses). Overlaying them produces a completed form.
4. Design Layers
Graphic designers sometimes create different layers of a document as separate PDF Files (background, content, decorative elements). Overlaying them produces the final composite.
How to Overlay PDF Files
- Upload: Go to the PDF Overlay tool and click "Select Background" to choose your main document (the one underneath), then "Select Foreground" to choose the PDF placed on top.
- Choose the Pages: Keep "Apply foreground to all pages" on to put one foreground page on every page (if the foreground has several pages, pick which one to repeat: first page, last page, or a page number), or turn it off to match pages one by one.
- Process: Click "Combine." The foreground is placed on top of the background.
- Download: Save the unified document.
How Pages Are Matched
With "Apply foreground to all pages" on, one foreground page (the first, the last, or the page you choose) is placed on every background page. With it off, pages are matched one-to-one (foreground page 1 goes on background page 1, page 2 on page 2, etc.); background pages without a matching foreground page stay as they are.
Pro Tips
- White Backgrounds Are Fine: The foreground is printed like ink on the page: its white areas let the background show through, so a letterhead with a white background works without any extra step.
- Test with One Page First: Before overlaying a 50-page document, test with a single page to verify the alignment looks correct.
- Combine with Watermarks: If you just need text stamps, our Add Watermark tool may be simpler. Use Overlay for more complex multi-element designs.
Secure & Private
Your documents are processed securely and permanently deleted from our servers within one hour. We never access or share your files.
Stop recreating documents from scratch on letterhead. Overlay your templates and produce polished, branded files in seconds.
Ready to try it yourself?
Use our free PDF Overlay tool to handle your documents now.