RowSlice Handles the CSV Files Excel Gives Up On

Field notes

The homepage organizes separate browser workflows around common large-CSV failures: splitting by column or size, merging by column name, removing duplicates, and repairing delimiters or encodings. Its stated implementation streams files a few megabytes at a time and writes results to disk, with free disk space described as the practical limit. A sample generator is listed for datasets from 1,000 rows to 20 GB, and the site explicitly calls out preservation of ZIP-code zeroes and long identifiers.