Free CSV Tools
Tools for working with CSV / TSV data without opening Excel. Convert to JSON, view as a table, deduplicate rows. Browser-side — your data never leaves your device.
CSV to JSONConvert CSV / TSV data to a JSON array of objects.
CSV ViewerView CSV as an interactive sortable table — no Excel.
Remove Duplicate LinesDedupe a list of lines (or CSV rows). Case-sensitive opt.
JSON to CSVGo the other direction.
About CSV
CSV (Comma-Separated Values) is the simplest possible data exchange format — one row per line, columns separated by commas (or tabs, semicolons, pipes). It's been the workhorse of business data interchange since the 1970s and remains the format every spreadsheet, database, BI tool and analytics platform reliably understands. The tools here cover the most common things you'd do with a CSV file outside Excel.