PDF Overlay
Composite one PDF over another. Perfect for applying corporate letterheads, official stamps, background watermarks, or technical grid overlays.
PDF Overlay
Composite one PDF over another. Perfect for applying corporate letterheads, official stamps, background watermarks, or technical grid overlays.
How to Use PDF Overlay
- Step 1: Upload Base PDF
- Step 2: Upload Overlay PDF (letterhead/template)
- Step 3: Adjust opacity and alignment
- Step 4: Export merged overlay PDF
Technical Specifications & Limitations
- Maximum file size: 50 MB.
- Composites two PDF documents: a base document and an overlay template.
- Adjustable overlay opacity from 0% to 100%.
Troubleshooting Common Issues
⚠Overlay dimensions don't match the base document.
SciHive automatically scales the overlay to match the base document's bounding box; ensure both share similar aspect ratios (e.g. A4 or Letter).
⚠Overlay blocks out base text.
Ensure the overlay PDF has a transparent background rather than an opaque white background.
🔒Privacy & Security Guarantee
All PDF processing for PDF Overlay occurs 100% inside your local web browser sandbox using WebAssembly and client-side JavaScript. Your documents, images, and data are never transmitted over the internet or saved to external servers. Full confidentiality is preserved for sensitive scientific research, financial records, and legal contracts.
Frequently Asked Questions
What is PDF overlay used for?
It is commonly used to apply corporate letterheads, official seals, background grids, or engineering stamps to plain reports.
Is this secure for corporate letterheads?
Yes, both files are composited locally on your computer with zero server involvement.
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