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Merge multiple PDF files into a single document online for free. Reorder files, preview page counts, and download the combined PDF. 100% browser-based, no uploads.
PDF merging combines multiple PDF documents into a single file by copying pages sequentially, preserving all content, formatting, fonts, and images from the original files.
Drop PDF files here or click to browse
Add two or more PDFs to merge. All processing happens in your browser.
| Scenario | Typical Files |
|---|---|
| Job application | Resume + cover letter + references |
| Report bundle | Title page + chapters + appendix |
| Invoice pack | Multiple monthly invoices |
| Legal filing | Forms + exhibits + declarations |
| Photo album | Scanned photo pages |
Formula
Merged File Size ≈ Σ (Individual File Sizes) − Shared Resource SavingsΣ (Individual File Sizes) = Sum of all input PDF file sizes in bytes
Shared Resource Savings = Size reduction from deduplicating fonts and resources shared across input files
Worked Example
Merging three PDF documents
Did you know? The PDF specification (ISO 32000) supports cross-reference streams that allow efficient incremental merging, and a single PDF can contain up to approximately 8.3 million pages (source: Adobe PDF Reference, Sixth Edition).
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