CSV Split by Column

Paste a CSV, pick a column, and get one downloadable CSV per unique value. Delimiter, quoting, and line endings are preserved. Runs entirely in your browser — no data leaves the page.

CSV input

Delimiter Quote First row is header

Split by column

Filename prefix Include header in each file

Preview of first group

Paste a CSV to see the split.

Common uses

Regional sales files — split an orders.csv by region, hand each finance team just their rows.
Per-tenant exports — split a multi-tenant events CSV by tenant_id so nobody sees anyone else's data.
Test-fixture generation — split a giant fixture CSV by test_group and load each subset into its own case.
Backfill batching — split by shard_id to parallelise a slow import.

The parser handles RFC 4180 quoting (double-quoted fields, doubled quotes as escape, embedded newlines and delimiters). Line endings are auto-detected. Empty values in the split column become a group named (empty).