Split large CSV files into smaller chunks by row count
Working with a CSV that is too large for your tools to handle? Split it into smaller files by row count, file size, or column values. Each output chunk keeps the header row intact so every piece is immediately usable.
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An upload tool rejects files over 5,000 rows and your export has 23,000.
Input
contacts.csv (23,000 rows) · split every 5,000
Output
contacts_1.csv … contacts_5.csv (last = 3,000 rows), header repeated in each
The file is chunked by row count (or by a column value) with the header re-written into every part, so each piece imports cleanly on its own. Splitting by a category column instead gives you one file per group in a single pass.
Working with a CSV that is too large for your tools to handle? Split it into smaller files by row count, file size, or column values. Each output chunk keeps the header row intact so every piece is immediately usable.
Break a million-row export into chunks that Excel or Google Sheets can open.
Split a dataset into manageable batches for parallel import or API upload.
Group rows by a column value (e.g., region, department) into separate files for distribution.
Reduce file size below attachment limits by splitting into smaller parts.
Large CSVs regularly exceed the row limits of spreadsheet software, choke email attachments, or slow down database imports. The splitter gives you three strategies: fixed row count (e.g., 10 000 rows per file), target file size (e.g., 5 MB chunks), or group-by splitting where rows sharing the same value in a chosen column go into their own file. All output files include the original header row.
Yes. Every output file starts with the original header so it can be used independently.
Yes. Select a column and the tool creates one file per unique value in that column.
Standard CSV files, packaged in a single zip download for convenience.
Rows and columns are parsed and transformed in memory in your browser. No record ever reaches a server.