Question 1

How do I split a large CSV file into smaller files?

Accepted Answer

Paste your CSV into the input area, choose a split mode (by rows per file, by number of files, or by unique values in a column), and click Split. Each chunk keeps the original header row. You can preview each file and download them individually or all at once.

Question 2

Is my CSV data safe?

Accepted Answer

Yes. All splitting happens entirely in your browser. Your CSV data is never uploaded to any server — everything runs locally on your device.

Question 3

Does each split file keep the header row?

Accepted Answer

Yes. When the 'First row is header' option is enabled (the default), the header row is automatically added to the top of every split file so each one is a valid, standalone CSV.

Question 4

What is the maximum CSV size I can split?

Accepted Answer

Because the tool runs in your browser, the practical limit depends on your device's memory. Most modern browsers can comfortably handle CSV files up to 50–100 MB. For extremely large files, splitting by a high row count works best.