CSV Splitter
Paste or upload a CSV file and split it into multiple smaller files, either by a fixed number of rows per chunk, or into an exact number of files divided as evenly as possible. The header row repeats at the top of every chunk, and each resulting file is offered as an individual download.
Reviewed by Vincenzo Manto, Founder & Lead Developer · Last updated September 27, 2026
How it works
- 1
Paste your CSV text or upload a .csv file.
- 2
Choose to split by a fixed number of rows per file, or into an exact number of files.
- 3
Enter the number you want.
- 4
Download each resulting chunk individually; the header row is included in every one.
Why split a CSV file?
Large CSV exports often need to be broken up before they can be imported into another system with row limits, emailed as attachments under a size cap, or processed in parallel by a script. Splitting by a fixed chunk size or into a fixed number of files covers both of those common needs.
Keeping every chunk usable on its own
A CSV file without its header row is just a pile of unlabeled values. This tool automatically re-adds the header to every chunk it produces, so each downloaded file can be opened, imported, or processed independently without any extra manual fix-up.
Frequently asked questions
Does every chunk include the header row?
Yes, as long as the "Header row" option is checked. The first row is treated as the header and is automatically repeated at the top of every split file so each one stays valid on its own.
What's the difference between the two split modes?
"Rows per file" creates as many files as needed so each one has at most that many data rows (the last file may have fewer). "Number of files" instead fixes the file count and divides your rows as evenly as possible across them.
Does this produce a ZIP archive?
No, each chunk is offered as its own individual CSV download button, so you don't need to unzip anything afterward.
Will splitting corrupt fields with commas or quotes in them?
No. The tool parses your CSV with proper RFC 4180-style quoting rules and re-serializes each chunk the same way, so multi-line and quoted fields remain intact.
Is my file uploaded to a server to be split?
No. Splitting happens in your browser using JavaScript, and nothing is sent anywhere.