Reassemble split file parts.

Join File takes a set of split parts and reassembles them back into the original, using the sidecar info to put everything in order and confirm the rebuilt file is whole - the other half of moving a big file in pieces.

Start the 14-day trial in the app. No payment method is required to try Foldout.

Foldout Reassemble split file parts tool screen on macOS
Processes on your MacTool work stays inside the local app.
Signed and notarizedBuilt for Apple Silicon Macs.
No usage trackingFoldout does not track what you do in the app.
Paddle checkoutPaddle shows price, tax, and terms before purchase.
What it does

Rebuild an original file from its split parts.

Rebuild an original from its split parts.

Use sidecar info to verify the result.

Recover a file someone sent in pieces.

Write a clean, complete output file.

Detailed capabilities

What Join File covers.

Concrete features, inputs, and workflow details for this tool.

Pieces back to whole

Combine compatible parts into the single original file, in the right order, without manual concatenation.

Verified rebuild

When sidecar information is present, the rebuilt file can be checked so you know it came back intact.

The receiving end

Exactly what you need when a large file arrives split across several parts.

How to use it

From opening the tool to saving the result.

  1. 01

    Add the split parts.

  2. 02

    Confirm they belong together.

  3. 03

    Run Join File.

  4. 04

    Review the rebuilt output.

Questions

Before you try Join File

Do parts need to match?

Yes. Join File expects compatible parts from the same split operation.

One app. 100+ tools.

Add Join File to your Mac toolbox.

Download Foldout, try the full toolbox, then choose a plan when it fits.