CSV Splitter

Import tools and email attachments choke on one giant CSV. CSV Splitter cuts the data rows into chunks of 10, 50, or 100 and repeats the header on every chunk.

Header row, then equal slices

The first row is the header. It is copied onto each part. Only the rows under it are counted toward 10, 50, or 100. A 250-row file with a header, split by 100, becomes three parts: 100, 100, and 50 data rows. Parts are labeled in order in one text result, separated so you can copy them into separate files. Quoted fields that contain commas stay one cell. The splitter does not move columns or drop blank rows by itself.

When the header is not really a header

A title sitting above the column names will be treated as the header, and the real header becomes a data row that then repeats in the wrong place. Delete that title line first, or use CSV Formatter so you can see the columns. CSV Viewer prints a simple table if you are unsure the first row is the right one. CSV Merger joins two files that share a header, which is the opposite of this page. TSV to CSV is for tab-separated exports before you split.

Copy parts out by hand

The output is one block of text, not a zip of files. Copy each part into its own sheet or upload. The work stays in the browser, which matters when the CSV holds customer rows. Splitting does not anonymize those rows. It only makes smaller tables. If two files must be one table again later, keep the header identical and use the merger.