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Convert and split .xlsx workbooks, or stack a tab-per-month workbook into one sheet. Payroll exports, price lists and member records, without retyping anything.
- Excel to CSV
Turn every tab of an .xlsx workbook into its own CSV, in one go.
- CSV to Excel
Turn a CSV into a real .xlsx workbook, with the leading zeros intact.
- Split Excel sheets
Get each tab out as its own .xlsx, when only one should be shared.
- Merge Excel files
Put 12 monthly workbooks into one file, as separate tabs or one table.
- Combine Excel sheets
Stack a tab-per-month workbook into one table you can filter.
- Excel to JSON
Turn a spreadsheet into JSON, one object per row.
- JSON to Excel
Turn JSON into an .xlsx workbook Excel won't mangle.
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 →