Large File Splitter

Pick a file, pick a chunk size, hit go. The file is split into evenly-sized pieces that you can email, upload, or carry across services that cap file size.

What it does

Large File Splitter divides any file into pieces of a size you choose. The pieces are sequentially numbered, so reassembly is just a matter of concatenating them in order — you can do it with the Windows copy /b command, or any utility that joins binary files.

When you need it

• Email attachments exceed the provider's cap (25 MB for Gmail, 20 MB for Outlook)
• FAT32 USB sticks can't hold a single file over 4 GB
• Cloud upload services time out on huge transfers but accept many small ones
• Splitting a database dump for transport across machines
• Burning across multiple optical discs in fixed sizes

Features

• Any file type, any size
• Custom chunk size in MB
• Sequentially numbered output pieces
• Portable single executable
• Works on every Windows version

How to rejoin the pieces

Open a Command Prompt in the folder containing the pieces and run:

copy /b piece.001 + piece.002 + piece.003 reassembled.bin

That's it — the original file is restored byte-for-byte.

System requirements

• Windows 7, 8, 10, 11 (older versions still supported)
• A few MB of free RAM
• Enough free disk space for the pieces (same total size as the input)