Free File Splitter and Joiner for Windows

Split Large Files. Join Them Exactly.

Break a large file into manageable parts, then rebuild a verified copy with every byte in place.

Download Free for Windows See The App

Version 8.1.0 · Windows 10/11 · 64-bit · 3.4 MB

Free to use Works with local files Light & dark

Free File Split Join dark Windows interface showing file splitting settings and a verified join workflow — Actual desktop app. Click to view full size.Prefer a light theme?

A large file should not stop a transfer.

A Clear Workflow

Three Simple Steps

Choose your files or settings, review your choice, then start.

1. Choose

Select your file and a destination for the parts.

2. Split

Choose a part size and keep the whole generated .parts folder.

3. Join

Select its manifest and verify the rebuilt file with all companion files present.

Built Around Your Task

A Complete File At The Other End.

Keep the parts organised and verify the final content before using the rebuilt file.

Read The Step-by-Step Guide

Make Manageable Parts

Split a file to a chosen size with the PeaZip engine.

Check Every Byte

SHA-256 verification checks the reassembled file before it appears.

Keep The Original

Create new parts and a new joined file without replacing existing files.

Before you begin

Keep the whole generated .parts folder: every numbered part, manifest.fsj.json and the .check integrity file where generated. This release rejoins sets created by this app, not arbitrary historical splitter formats. Splitting is not compression or encryption.

Your Workspace, Your Choice

Clear In Light. Comfortable In Dark.

Start in dark mode or switch to light. Your theme is remembered.

View original screenshot

Dark theme · Actual Windows interface · Click for the original PNG

Practical Help

Know What To Expect

Split And Rejoin A Large File

Create manageable parts, keep the manifest and verify the joined file before using it.

Supported Scope And Limits

Learn why every part and the app's manifest are needed, and why splitting is not compression.

When Something Does Not Work

Check inputs, access and cancellation before trying again.

Questions, Answered

Before You Download

Straight answers about the current version and its limits.

Will splitting reduce the total file size?

No. Splitting divides the data into parts. It does not compress the original or make the contents private.

What do I send to the recipient?

Send the entire generated .parts folder, including all numbered parts, manifest.fsj.json and the .check integrity file where generated. Keep them together so the receiver can verify and join the file.

Can it join a file if one part is missing?

No. A missing, modified or reordered part, manifest or required .check integrity file stops the join. The app does not publish an unverified final file.

Are my original files changed?

No. Splitting reads the original. Joining creates a new file and does not overwrite an existing destination.

Can it join parts from an older splitter?

This release uses its own verified manifest workflow. Do not assume that arbitrary .001 files or parts from the previous version use the same format.