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SnapOtter/apps/docs/tools/data/split-csv.md
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SnapOtter 8532f3227b docs: audit all 157 tool pages against live schemas
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---
description: Split a CSV into smaller files by row count.
---
# Split CSV
Split a large CSV or TSV file into smaller files by row count. Returns a ZIP archive containing the parts.
## API Endpoint
`POST /api/v1/tools/split-csv`
Accepts multipart form data with a CSV file and a JSON `settings` field.
## Parameters
| Parameter | Type | Required | Default | Description |
|-----------|------|----------|---------|-------------|
| rowsPerFile | integer | No | `1000` | Number of data rows per output file (1--1,000,000) |
| keepHeader | boolean | No | `true` | Repeat the header row in each output file |
## Example Request
```bash
curl -X POST http://localhost:1349/api/v1/tools/split-csv \
-H "Authorization: Bearer si_your-api-key" \
-F "file=@large-dataset.csv" \
-F 'settings={"rowsPerFile": 500, "keepHeader": true}'
```
## Example Response
```json
{
"jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
"downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/large-dataset_parts.zip",
"originalSize": 1048576,
"processedSize": 1050000
}
```
## Notes
- Output is always a ZIP archive containing the split CSV parts, named sequentially (e.g. `part-1.csv`, `part-2.csv`).
- When `keepHeader` is `true`, each part includes the original header row so each file can be used independently.
- Both CSV and TSV files are accepted as input.
- The row count refers to data rows only; the header row is not counted.