Split CSV Files

How do you split a large CSV file into smaller files?

Many systems impose row limits on imports, or a file is simply too large to open comfortably in a spreadsheet application. This tool breaks a single large CSV into smaller files by row count, each containing the original header row plus the specified number of data rows.

How to use it

Upload your CSV file and enter how many data rows you want in each output file. The default is 500 rows. Click Process file and the tool calculates how many output files are needed and shows a download button for each part. Each file includes the original header row so it opens correctly on its own. Everything is processed in your browser and never uploaded to or stored by this site.

Tips

Choose a row count that fits within the import limit of whatever system you are feeding the files into. If you are splitting a file to upload into a tool with a 1,000-row limit, set the rows-per-file value to something comfortably below that limit to leave room for variation. The last output file will typically have fewer rows than the others if the total does not divide evenly.

Frequently asked questions

Does each split file include the header row?

Yes. Every output file starts with the original header row from your source file, so each piece is independently usable and will open correctly in a spreadsheet application or import correctly into another system.

Can I rejoin the split files later?

Yes. Use the Merge CSV Files tool on this site. Select all the split files and merge them back into one, and the tool will handle the duplicate header rows automatically.

Important

This tool provides estimates and general-purpose documents, not financial, tax, legal, or professional advice. Verify important results before relying on them.

Support

Problem with this tool or suggestions for improvement? Please email support@niftyutilities.com.