← Blogby Marcell Almeida

How to split a large CSV file into smaller files

Paste a large CSV, set rows per chunk — download-ready parts with headers preserved.

Email attachments and import tools cap file size. The CSV Splitter divides a file into equal row chunks while repeating the header row in each part.

Try it — paste CSV and set chunk size

Open full tool →

How it works

  1. Paste CSV — full file with header.
  2. Rows per chunk — e.g. 1000 rows per file.
  3. Copy chunks — each output includes the header.

Header handling

The first row is treated as the header and prepended to every chunk so imports work without manual editing.

Merge back

Combine parts with Merge CSV Files when needed.

The How to split a large CSV file into smaller files is free, runs locally, and never sends your data to a server. More converter tools at maratool.com.