Converters
Data & Spreadsheets
CSV, XLSX, JSON and ODS — convert between data formats. · 9 tools
Spreadsheets and data files are where small conversion mistakes cost real time: a leading zero dropped from a postcode, a date flipped to the wrong month, a semicolon-separated file crammed into one column. These tools detect delimiters and encodings, keep text as text unless it is clearly numeric, and write ISO dates.
Everything runs in your browser, so exports containing customer or financial data never leave your computer. Files with hundreds of thousands of rows are fine on a desktop.
Spreadsheets
CSV to ExcelPopularOn-deviceCSV into a proper Excel workbook, delimiter auto-detected.Excel to CSVPopularOn-deviceExcel sheets to CSV with chosen delimiter and encoding.ODS to ExcelOn-deviceLibreOffice Calc ODS to Excel XLSX.Excel to ODSOn-deviceExcel workbooks to open-standard ODS.XLS to XLSXOn-deviceLegacy XLS to modern XLSX.
How to choose
- From a system export to Excel
- CSV to Excel handles separators, quoting and encodings that Excel’s own import gets wrong.
- From a spreadsheet to code
- Excel to JSON or CSV to JSON produce typed arrays of objects; JSON to Excel goes the other way with nested fields flattened into columns.
- Between office suites
- ODS to XLSX and XLSX to ODS keep formulas and formatting; XLS to XLSX modernises old files.