How to use File Splitter online, free

Splits a large file into smaller equal parts - useful when you need to transfer a file through a channel with a size limit (like an email attachment cap or a USB drive with limited free space), by breaking it into pieces that can be rejoined later.

Large files, ZIPs and CAD drawings should not have to leave your laptop to be split, joined or previewed.

File Splitter is a good fit when sending large files through attachment-limited email systems.

Why this exists

File Splitter is built around a few practical wins, not a long feature list:

• Bypasses strict file-size limits in transfer channels.
• Enables transport of huge files across constrained media.
• Maintains exact binary integrity when rejoined properly.
• Simple workflow for one-time packaging needs.

Walkthrough

1. Upload large file. Select the file that exceeds transfer or storage size constraints.
2. Set part size. Choose chunk size based on email, storage, or upload limits.
3. Generate split parts. Create sequential file segments for transport.
4. Download all pieces. Keep every part together for successful future reassembly.

Jobs it is built for

• Sending large files through attachment-limited email systems.
• Moving big archives across small-capacity USB drives.
• Uploading large media to platforms with per-file caps.
• Creating manageable chunks for staged transfer workflows.

Worth knowing before you start

• Name and keep all parts in one folder before transfer.
• Choose part size slightly below hard limit to avoid rejection.
• Verify checksum after rejoining for critical files.
• Avoid renaming part sequence labels manually.

What not to expect

• Transferring only some parts and expecting successful merge.
• Using part sizes too close to upload cap and failing transfer.
• Mixing chunks from different source files.
• Losing part order metadata during manual renaming.

Privacy, in one paragraph

File Splitter runs in your browser. The file or text you paste stays on your device. There is no account, and nothing is stored on a ToolBox server for this job.

Related tools worth opening next

If this is one step in a longer job, these usually come after it:

• File Joiner - Rejoin split file parts back into the original file
• ZIP Creator - Bundle multiple files into a ZIP archive in your browser
• Split PDF - Split PDF into separate pages

Short answers

How do I put the file back together after transferring the split parts?

Use the File Joiner tool with all the split parts to reconstruct the original file exactly as it was, in the correct order.

Can I choose the size of each split part?

Yes - specify your desired part size (like to fit a specific size limit), and the tool divides the file into that many equal-sized pieces.

Does splitting affect the content or quality of the file?

No - splitting is a purely mechanical division of the file's raw data; nothing about the actual content changes, and rejoining the parts correctly restores the exact original file.

Open the File Splitter when you are ready. It is free, and you do not need an account.