CSV to Excel
Convert a CSV file to Excel (.xlsx) in your browser. Download a real spreadsheet — nothing is uploaded.
Split CSV
Split a large CSV into smaller files by row count. Download a ZIP of chunks from your browser.
Drop a CSV file here or click to choose
Split locally — nothing is uploaded
How to use Split CSV
Split a large CSV into smaller files by row count. Download a ZIP of chunks.
Everything runs locally in your browser — your files are never uploaded to a server.
Split CSV FAQs
How do I split a large CSV into smaller files?
Drop a CSV, set how many rows per chunk, then download a ZIP of smaller CSV files. Splitting runs in your browser.
Is splitting CSV free?
Yes. Every Excel and CSV tool on ReallyUseful.Tools is free to use, with no account or subscription required.
Are my files uploaded?
No. Files are processed in your browser on this device. Nothing is uploaded to our servers.
Does each chunk keep the header row?
Yes. The header is repeated at the top of each chunk file.
More Excel/CSV
Excel to CSV
Convert Excel .xlsx or .xls to CSV in your browser. Choose a sheet and delimiter, then download.
CSV viewer
Open and browse a CSV in a paginated table in your browser. No upload — view large files locally.
Merge CSV files
Combine multiple CSV files into one in your browser. Rows are stacked and headers aligned by name.
CSV to XML
Convert CSV rows into structured XML in your browser. Each row becomes an element — nothing is uploaded.