Split a large CSV file online into multiple smaller files by row count or by unique values in a chosen column.
Free for files up to 5 MB and 10,000 rows. Files are processed in your
browser — nothing is uploaded to a server. No account required.
About CSV Splitter
Split a large CSV file into multiple smaller files by row count or by unique values in a column.
Useful when you need to break large datasets into manageable chunks for email, API uploads, or batch processing.
Related tools
CSV Viewer — Free online CSV viewer to open, search, sort, and paginate large CSV files instantly in your browser — no upload required.
CSV Editor — Free online CSV editor to edit cells, add or delete rows and columns, with undo/redo and instant export back to CSV.
CSV Validator — Validate CSV files online — find missing values, cells that break their column's type, duplicate headers, and mojibake left by a bad export.
CSV Cleaner — Clean messy CSV files online: trim whitespace from every cell, drop rows that are entirely empty, and tidy header names — in one pass, in your browser.
CSV Deduplicator — Find and remove duplicate rows in CSV files online — match across selected columns and export a clean, unique dataset.
CSV Sorter — Sort CSV files online by one or multiple columns, ascending or descending, with stable multi-key ordering and instant export.