Support the project Main site 繁體中文
Converter Hub / PDF document workflow

PDF Merger

Drop multiple PDFs, reorder them, and merge them into one PDF in your browser.

Back to Converter Hubpdf-lib / SheetJS Local processing

Order PDFs and merge them

Drop multiple files and reorder them; files are read only in this browser.

Progress0%

Choose a file to begin.

Output preview

Waiting for an output file.
Features and quick guide

Why use this tool?

Merge multiple PDFs in a custom order into one file for reports, handouts and research packets.

3-step quick guide

  1. 1
    Choose or drop multiple PDFs and review the list.
  2. 2
    Use the arrows to set the merge order.
  3. 3
    Merge locally and download one PDF.

Privacy promise

PDF and spreadsheet bytes are parsed and exported only in this browser tab; they are never sent to a server.

No file-upload endpoint is used; speed depends on your device and browser support.

Frequently asked questions

Are files uploaded?

No. pdf-lib reads PDF bytes only in this tab.

Can I reorder files?

Yes. Use the up and down arrows on each row.

Is there a file-size limit?

There is no added server limit, but large PDFs depend on browser memory and device performance.