CleanMySheet guide

Turn a messy Excel file into a clean CSV

Drop .xls or .xlsx, pick a sheet, run cleaning presets, and download CSV. Excel serial dates and accounting negatives are converted before export. Free export is 500 rows; Pro is unlimited.

Open the cleaner

Steps

Drop the workbook
Choose the sheet
Apply Financial or CRM presets
Download CSV

Formulas

SheetJS typically gives cached calculated values, not the formula text. If a cell is blank in the export, recalculate in Excel first.

Related guides

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Fix Excel spreadsheets locally: serial dates, accounting negatives, duplicates, multi-sheet workbooks. CleanMySheet parses XLSX in your browser.
Clean a CSV online without uploading it
Clean CSV files in your browser: trim spaces, fix dates, remove duplicates, split names, and export. CleanMySheet never uploads your sheet in Strict mode.
Clean QuickBooks and finance CSV/Excel exports
Convert accounting negatives, strip currency symbols, standardize dates. Finance preset runs locally.

Turn a messy Excel file into a clean CSV

Steps

Formulas

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