Spreadsheet Converter
Convert spreadsheets between XLSX, CSV, ODS, HTML, and JSON in your browser.
Overview
How to convert spreadsheets between XLSX, ODS, CSV, HTML and JSON
Convert Excel and OpenDocument spreadsheets between XLSX, XLS, ODS, CSV, HTML, and JSON. Everything runs locally with SheetJS — your spreadsheets are never uploaded. Drop a file and choose the output format.
Use cases
When to convert spreadsheets between XLSX, ODS, CSV, HTML and JSON
- 01
Converting an Excel export to CSV for a database import
- 02
Turning a spreadsheet into JSON for an app
- 03
Converting ODS to XLSX for Excel compatibility
Examples
Spreadsheet converter examples
report.xlsx
ex 01report.csv
Convert an Excel file to CSV
data.csv
ex 02data.xlsx
Convert a CSV to a real Excel workbook
FAQ
Spreadsheet converter: common questions
Yes — XLSX and legacy XLS as input, and XLSX, ODS, CSV, HTML, or JSON as output. All processing happens in your browser.
Cell values and structure are preserved. Complex formulas are evaluated to their last-saved values; rich styling is not carried into all formats.
Converting to XLSX or ODS preserves every sheet, because both are multi-sheet containers. Converting to CSV, HTML or JSON exports the first sheet only — those formats hold a single table and have no way to represent a workbook. If you need a different sheet, reorder the workbook first, or export each sheet separately.
CSV carries no type information, so every value arrives as text and the receiving application guesses. Spreadsheet software usually guesses "number", which turns a ZIP code of 01234 into 1234 and a long product code into scientific notation. This is a property of CSV, not of the conversion — if types matter, convert to JSON or Parquet instead.
Yes, and it is the usual reason to touch an XLS file at all. The legacy format caps out at 65,536 rows and 256 columns per sheet, and support for it is gradually being withdrawn. Converting to XLSX lifts those limits and is lossless in practice for data and formulas — very old macro content is the exception.
No. The workbook is parsed and written in your browser, so nothing needs to be installed and nothing is uploaded. This is often the practical reason to use it: reading an ODS or XLSX on a machine with no office suite, without emailing the file to yourself.
More
Tools that pair well
Last updated