Split a large CSV into several smaller ones locally - by row count, header kept. No upload.
Running locally on your device ...
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Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
Huge CSV files overwhelm editors, import limits and email attachments. This tool splits a CSV into several smaller files with a fixed row count - and bundles them as a ZIP to download.
Choose how many data rows each part should contain. Optionally the header row is repeated in every part so the columns stay named everywhere. The row total matches the original.
Everything happens locally in the browser - the CSV is not uploaded, which is crucial for datasets with personal data.
Concrete examples: a web shop allows only a thousand entries per upload during product import, a newsletter tool caps the recipient list, or accounting software chokes on huge batches. In all these cases you split the collection beforehand into manageable batches of fitting length and work through them one after another. Because the heading travels along on request, each part stays independently usable and immediately readable.
| Input formats | CSV |
|---|---|
| Output format | ZIP |
| Batch processing | No |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: Split by data rows (not by columns). The delimiter is auto-detected; output is standardised CSV. Very large files use a lot of memory on mobile.
No, the split happens entirely locally in the browser.
Optionally it is repeated in every part.
Yes, all data rows together equal the original.
As a ZIP with all part CSVs (or one CSV if everything fits in one).
Use the "Split XLSX" tool for those.