Does each part keep the header row?

Yes by default, so each file imports cleanly on its own. Untick the option for raw row chunks.

How large a file can I split?

Files of tens of megabytes work fine in modern browsers, since nothing is uploaded.

Rows. A quoted cell containing line breaks still counts as one row — the parser is CSV-aware, unlike naive line splitters.

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CSV Splitter — Split Large Files

Split a large CSV into smaller files free in your browser. Choose rows per file, keep headers in every chunk — no upload.

100% free
Runs in your browser — nothing is uploaded
No signup required

Rows per fileRepeat header in every file

Import tools cap uploads, email systems choke on big attachments, and Excel slows to a crawl past a few hundred thousand rows. Splitting a CSV into fixed-size chunks fixes all of it.

Choose how many rows per file and the splitter produces numbered parts, each with the header row repeated so every chunk is a valid standalone CSV. Processing is local — even huge files never leave your machine.

Example

Input

2,500-row CSV, 1000 rows per file

Output

part-1.csv (1000), part-2.csv (1000), part-3.csv (500) — each with the header

Your data never leaves your device

Like everything at OpenCSV, this tool processes files locally in your browser. There is no upload, no server-side processing, and no copy of your data anywhere — which makes it safe for customer lists, financial exports, and other sensitive files.

/ frequently asked

Frequently Asked Questions

Yes by default, so each file imports cleanly on its own. Untick the option for raw row chunks.

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