Sachin Kumar
Engineer
BE
Combine documents in the order you choose. Processing runs locally with pdf-lib in a Web Worker; large files use transferable buffers to save memory.
Last Updated: 01 May 2026
Drop PDF files here
Combine multiple PDFs — drag to set merge order
All merging runs locally in your browser with pdf-lib — files are
not uploaded
PDF Merger helps you combine documents in the order you choose. processing runs locally with pdf-lib in a web worker; large files use transferable buffers to save memory. It is commonly used by professionals, students, general users for pdf merge, combine pdf, merge pdf online.
Tool Admins
How to Merge PDF Files
Combine contracts, invoices, or reports into a single PDF without sending files to a server.
How It Works
- **Upload PDFs** — Select or drag multiple files
- **Reorder** — Drag the list to set merge order
- **Optional privacy** — Check “Remove metadata” to strip title, author, creator, and producer fields from the output
- **Merge** — A Web Worker runs pdf-lib; your buffers are transferred, not duplicated on the wire inside the page
- **Download** — Save the merged PDF
Security & Privacy
Everything runs in your browser. Files are not uploaded. You can strip common metadata tags from the merged file for a cleaner, more private document.
Limits
Very large PDFs can use a lot of memory while merging; close other heavy tabs if you hit browser limits.