Free Online Excel & Spreadsheet Tools
Convert legacy XLS sheets to modern XLSX, enable VBA macros with XLSM conversions, and transform CSV tables into clean JSON data instantly with client-side parsing.
Convert standard Excel XLSX workbooks to macro-enabled XLSM format. Unlocks VBA macros, automation scripts, and advanced Excel features.
Upgrade legacy Excel XLS files to the modern XLSX format. Improves compatibility, reduces file size, and enables advanced Excel features.
Convert old binary Excel XLS files to the modern macro-enabled XLSM format in one step, preserving all data and sheet structure.
Convert CSV spreadsheet data to clean, properly formatted JSON. Automatically detects headers and handles commas within quoted fields.
Convert JSON arrays or objects to CSV format. Download results as a .csv file ready to open in Excel, Google Sheets, or any spreadsheet app.
Preserve Formulas & Data
Our spreadsheet engines preserve cell formulas, sheet hierarchies, numbers, and dates accurately across formats.
Confidential Financials
Spreadsheets run locally in your browser so sensitive budgets, accounting data, and customer lists never upload to external servers.
Developer Friendly
Easily convert between CSV and JSON formats with proper quoting, header inference, and nested array handling for APIs.