✂️ CSV Splitter

Free online CSV splitter. Split large CSV files by row count or number of files. Supports header retention and custom delimiters. Pure frontend, no data upload.

Delimiter

Split By

Value

Keep header (repeat first row in each file)

Input CSV Data

How to Use

Paste CSV
Paste your CSV data in the text area.
Set Options
Choose split mode, value, and header option.
Split & Download
Click Split, then copy or download each file.

FAQ

Why split CSV files?

Large CSV files can cause slow opening, memory overflow, or upload limits. Splitting into smaller files makes them easier to process, analyze, and transfer. Common scenarios: Excel row limits, email attachment limits, API batch import limits.

What is the difference between splitting by rows vs files?

By rows: specify rows per file, the tool calculates the number of files. By files: specify the number of files, the tool calculates rows per file. Both support header retention.

How is the header handled?

If "Keep header" is checked, the first row (header) is repeated in each split file, ensuring each file is a complete CSV. If unchecked, the header only appears in the first file.

How large a file can I process?

The tool runs locally in the browser, limited by browser memory. Generally handles files up to tens of MB. For very large files (100MB+), consider dedicated desktop tools.

Is my data uploaded to a server?

No. All processing happens locally in your browser. CSV data is never uploaded to any server.