Overlay PDF Online — Merge PDF Layers & Apply Template Overlays
Upload a base PDF and an overlay PDF (letterhead, template, watermark). The overlay is applied to every page of your base document. All processing in your browser.
Base PDF (main document)
Overlay PDF (template/letterhead)
PDF Overlay & Layer Merge
Combine PDF layers for professional documents
Layer Control
Choose whether the overlay goes on top of or behind your base document content.
Template Support
Perfect for applying company letterheads, form templates, or decorative borders from a PDF.
100% Private
Both PDFs are processed entirely in your browser. Nothing is uploaded.
FAQ
PDF overlay places the content of one PDF on top of (or behind) another PDF. Common uses include applying letterhead templates, branded backgrounds, or form templates.
Yes — choose 'Below content' to place the overlay behind your base document, or 'Above content' to place it on top.
Yes — the first page of the overlay PDF is applied to every page of the base document.
Only the first page of the overlay PDF is used. If you need different overlays per page, process each page separately.
Yes — this is one of the most common uses. Create a PDF with your letterhead design and overlay it onto your document.
No — the base document's page dimensions are preserved. The overlay is scaled to fit each page.
Yes — merging combines PDFs sequentially (one after another). Overlaying stacks them on the same pages (one on top of the other).
Related Tools
Other PDF tools you may find useful
Overlay Your PDFs Now
Free PDF overlay tool — instant, private.