Split CSV Files Online
- ✓ 100% Free
- ✓ No upload — runs in your browser
- ✓ No signup
- ✓ No ads
Free CSV splitter and chunker: break a large CSV file into multiple smaller files by row count. Each part keeps the header row, big multi-GB files are supported, and the output downloads as a ZIP archive.
Drop a CSV file here or click to browse
Supports .csv
Default: 1,000,000 rows per part.
How to Split a CSV File
- Select or drag your CSV file into the upload area above.
- Set the number of rows per file (default is 1,000,000).
- Click Split CSV. Processing happens in your browser.
- Download the ZIP archive containing the numbered CSV parts.
Split a Big CSV into Multiple Files by Rows
This CSV chunker breaks one large file into numbered parts based on the number of rows you choose. Set 500,000 rows per file, for example, and a 2-million-row export becomes four separate CSV files inside a single ZIP. It is the fastest way to break a CSV file into multiple files without a script or command line.
Common Use Cases
- Split a large CSV export that exceeds Excel's 1,048,576 row limit.
- Break a big CSV file into smaller parts for batch database imports.
- Chunk data for parallel processing in ETL pipelines.
- Split a multi-GB CSV that is too large to open in Excel or Google Sheets.
- Share large datasets as smaller, more manageable files online.
DataMani vs Typical Online CSV Splitters
Most online CSV splitters are free only up to a point — they cap the file size, upload your data to a server, or ask you to sign up. DataMani runs entirely in your browser, so there is no size cap, no upload, and no account to create.
| DataMani | Typical online splitters | |
|---|---|---|
| Price | Free, no limits | Free tier, then paid |
| Max file size | Unlimited (your device's memory) | Often capped (100 MB–4 GB) |
| Files uploaded to a server | No — stays in your browser | Usually yes |
| Signup required | No | Often |
| Ads | None | Common |
Frequently Asked Questions
How do I split a big CSV file into multiple files?
Drop your CSV above, set how many rows you want per file, and click Split CSV. The tool chunks the file into numbered parts and downloads them as one ZIP archive.
Can I split a large CSV that won't open in Excel?
Yes. Big multi-GB CSV files are supported — processing happens in your browser, limited only by available memory, so you can chunk files far larger than Excel's row limit.
Does each part include the header row?
Yes. Every split file includes the original header row so it is a valid, standalone CSV.
Are my files uploaded to a server?
No. All processing happens entirely in your browser. Your files never leave your device.