File Splitter
Split any large file into equal parts for easy transfer
100% free. Runs entirely in your browser - your files and data never leave your device and nothing is uploaded to any server.
Drop a file here or click to choose
Any file type · up to 2 GB
About this tool
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.
How to use this tool
- Upload large fileSelect the file that exceeds transfer or storage size constraints.
- Set part sizeChoose chunk size based on email, storage, or upload limits.
- Generate split partsCreate sequential file segments for transport.
- Download all piecesKeep every part together for successful future reassembly.
Choosing a part size
Choose a part size just under the limit you are working with: about 20 MB for most email attachments, 25 MB for Gmail, or the upload limit of the site you are using. Name and keep all the parts together.
A single part cannot be opened on its own; the recipient needs every part and the File Joiner to rebuild the original.
Key features
- 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.
Common uses
- 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.
Tips for better results
- 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.
Mistakes to avoid
- 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.
Frequently asked questions
Use the File Joiner tool with all the split parts to reconstruct the original file exactly as it was, in the correct order.
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.
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.
Pick a size just under your limit: about 20 MB for most email providers, 25 MB for Gmail attachments, or the free space on your drive. Smaller parts mean more files to send but easier retries if one fails.
No. Each part is a raw slice of the original bytes, so it cannot be opened until all parts are joined back together in order.
Send them a link to the File Joiner along with the parts. They select all the pieces, and the joiner rebuilds the original file in their browser.