CSV and spreadsheet tools
Inspect a file first, clean it, then convert, compare or summarize it. Each tool explains how it treats headers, delimiters and identifiers such as leading zeros, so check those notes before exporting.
Inspect and prepare spreadsheet data
CSV viewer and editor
Open large CSV files, sort, filter and edit cells, then save.
Spreadsheet data cleaner
Remove duplicate rows, trim spaces, fix case, and normalize values per column.
Date-column normalizer
Standardize mixed date formats to ISO or your format, flagging ambiguous dates.
Email and phone list formatter
Clean email and phone lists, format numbers to E.164, and flag invalid entries.
Convert, merge and compare
Summarize and generate datasets
Guides
- Working with CSV files without breaking them: Delimiters, quotes, encodings, leading zeros and the Excel habits that silently change your data, and how to avoid them.