CSV Splitter breaks a large CSV into smaller ones. Split every N data rows, into a chosen number of parts, or group the rows by the value in one column.
The header row is repeated into each part by default. It runs in your browser.
Yes, unless you say the input has no header row.
It makes one file for each distinct value in the column you name, holding just the rows with that value.
It works in memory in your browser, so very large files are limited by your device's memory rather than a fixed cap.
No. The tool runs entirely on this page.