XLSX format guide and tools
XLSX stores spreadsheet workbooks. The available tools exchange cell data with CSV or JSON.
Before you convert
These are data conversions, not a spreadsheet calculation service. Review the documented worksheet selection, formula handling and size limits; flat outputs cannot preserve all workbook features.
Check each tool’s processing label: browser and server tools handle files differently.
Available XLSX tools
Secure server processing
Convert Excel XLSX to CSV
Extract Excel workbook data to standard RFC 4180 CSV format.
Documents & DataOpen tool
Secure server processing
Convert CSV to Excel XLSX
Transform tabular CSV data into a Microsoft Excel XLSX workbook with temporary server processing.
Documents & DataOpen tool
Secure server processing
Convert Excel XLSX to JSON
Extract Excel spreadsheet data into a structured JSON array of objects.
Documents & DataOpen tool
Secure server processing
Convert JSON to Excel XLSX
Convert JSON data arrays and objects into a structured Excel XLSX spreadsheet.
Documents & DataOpen tool