ConvertThoseFiles logoConvertThoseFiles.com

Concat PDFs

Concatenate PDF files into a single document.

Stitch multiple PDFs end-to-end in the order you choose. Perfect for combining chapters, statements, or scanned batches.

Open the Concat PDFs converter Private uploads Files never leave your device Free — no signup

How your files are handled

  • No uploads

    Your files never leave your device.

  • In-browser processing

    Every conversion runs locally in your browser.

  • Nothing stored

    Files aren't uploaded, so there's nothing to keep.

  • Privacy by default

    We never share or index your files.

How Concat PDFs works

  1. 1

    Upload PDFs

    Drop the PDFs you want to concatenate.

  2. 2

    Reorder

    Drag to set the concatenation order.

  3. 3

    Download

    Grab the concatenated PDF.

Frequently asked questions

Is my file private?
Yes. The conversion runs entirely in your browser — your file is never uploaded to any server, so it stays on your device.
What's the file size limit?
Every tool is free with a 25 MB per-file limit — no accounts and no paid tiers.
Do I need to install anything?
No. ConvertThoseFiles runs entirely in your browser — no plugins, no desktop app, no signup required.

Related converters

Ready to convert?

Launch the live Concat PDFs converter and have your file ready in seconds.

Start Concat PDFs