CSV splitter is a stand alone exe which allows you to split a large CSV files into number of pieces and you can even set the max number of lines in each files.
Many a times there is a restirction at some places on the size of file that is to be uploaded. If that comes with your CSV file this tool will solve your problem. Your original file is untouched and being a standalone you can carry it in your USB and use any where you want. Download CSV Splitter
Related : Got a huge file to zip but doesnt fit in one USB, Learn how to split and zip files using winrar