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Convert and split .xlsx workbooks without uploading them. Spreadsheets are where payroll, pricing and customer data actually live, which is exactly why they shouldn't be handed to a stranger's server.
- Excel to CSV
Convert an .xlsx workbook to CSV, one file per sheet.
- CSV to Excel
Turn CSVs into a real .xlsx workbook, one sheet per file.
- Split Excel sheets
Split a multi-sheet workbook into one file per sheet.
Nothing here is uploaded
These tools are ordinary web pages that happen to contain the whole program. When you choose a file, your browser reads it from your disk into its own memory and the work happens there. There is no upload step, because there is nowhere for it to go — the site is static files with no backend.
That has a practical consequence beyond privacy: there are no queues, no file size caps set by someone else's bandwidth bill, and no daily limits designed to sell you an upgrade. How this works →