XLSX to CSV Converter

Convert tabular CSV, TSV, XLSX and JSON files with clear limits and no type guessing.

This page is optimized for XLSX → CSV.
Prefixes formula-like text (=, +, −, @) with an apostrophe. Turn off only if you need the exact original text. XLSX always stores text as text.

Notes

  • Files are uploaded for conversion and are not retained by the application.
  • Up to 20,000 rows, 100 columns and 200,000 cells. Headers must be nonempty and unique.
  • CSV/TSV use UTF-8 and keep text such as leading zeros and “NA”. JSON accepts flat records, including one object per line.
  • XLSX reads the first worksheet only. Formulas and error cells are rejected; paste values into a copy first. Formatting, charts and other sheets are not carried over.
  • Dates become ISO text. Empty XLSX cells become null in JSON; JSON numbers stay numeric. CSV has no data types.