CSV Splitter
Split a large CSV into smaller chunks.
Break a big CSV into parts
Some tools cap import size. This splits a large CSV into chunks of the row count you choose, repeating the header on each chunk so every piece is a valid file on its own.
It is the answer to an import that rejects a file for being too big, or to sharing a manageable slice of a large dataset without sending the whole thing.
Header on every chunk
That means each part imports cleanly without manual fixing. The split runs in your browser and nothing is uploaded. Your file is split on your device and never uploaded.
Frequently asked questions
What does this csv splitter do?
Split a large CSV into smaller copy-ready chunks with optional repeated headers.
How are the parts labeled?
Each chunk starts with a "-- part N --" line so you can see where one part ends and the next begins. Copy each part into its own file.
Does every part get the header row?
With the header option ticked, the first row is treated as the header and repeated at the top of every part, and the rows-per-part count excludes it.
Why split a CSV at all?
Many importers cap file size or row count, such as email platforms or CRMs that accept a few thousand rows at a time. Splitting keeps each upload under the limit.
Related tools
More free browser utilities for data cleanup, formatting, and developer workflows.