CSV Splitter

Upload a CSV, pick which columns to keep, and split it into chunks of up to 800,000 rows each. Maximum input: 40,000,000 rows.

1. Upload CSV

Any number of columns. Header row is auto-detected and can be toggled below.

Drop CSV here or click to browse

.csv only

3. Configure split

Choose the split size and whether to deduplicate using the key column.

Rows per file

Maximum 800,000 per file.

Deduplicate by key column

Pick a key column to enable

4. Export

Output CSV includes a header row with the kept column names.