Merge PDFs Online – Merge Multiple PDFs Offline
This tool lets you merge PDFs online (locally in your browser). Quickly merge multiple PDFs, visually reorder pages (drag, arrow buttons, keyboard) and output a single combined file. Private, fast, and free—no upload. Ideal when you only need to merge two PDFs or a larger batch.
How It Works
Pages are parsed client‑side. Thumbnails render on demand with a lightweight pdf.js pass; you can drag, use arrow buttons, or press Alt/Option + ↑ / ↓ to move focused pages. The merge streams pages directly with pdf-lib.
Why Merge PDFs Client‑Side?
- Privacy: documents never leave your device
- Speed: no network upload or wait queue
- Control: reorder / drop pages before merge
- Portability: works offline once loaded
Planned Enhancements
- Select multiple pages for bulk move
- Edit metadata (Title / Author) pre‑export
- Dark / light thumbnail toggle
Tip: For very large PDFs, merge in stages: add two files, merge, then merge the result with the next file to conserve memory.