Ultraconvert
Join
100% client-side — your PDFs never leave your device

Merge PDFs,
without the upload.

Combine several PDFs into one file, in any order — right in your browser. Drag, drop, done.

How it works

  1. 1

    Drop your PDFs

    Add two or more PDF files. They're read locally with pdf.js — no upload.

  2. 2

    Drag to reorder

    Arrange the files in the order you want them combined.

  3. 3

    Merge & download

    Get one combined PDF, assembled entirely in your browser with pdf-lib.

Frequently asked questions

Are my PDFs uploaded to a server?+

No. The files are read and merged entirely in your browser. Your PDFs never leave your device.

Can I choose the order of the files?+

Yes. Drag the cards (or use the arrow buttons) to set the order before merging — that's the order pages appear in the output.

Is there a limit on the number or size of PDFs?+

No hard limit beyond your device's available memory. Everything runs locally.

Is it free?+

Yes — free, no signup, no watermarks.