XLSX to CSV Cleaner
Universal CSV Cleaner can read the first worksheet from a modern Excel `.xlsx` workbook in your browser, clean the table, and export standard CSV. This is useful when a workbook is really a simple table but needs cleanup before import into another system.
What is supported
| Input | Support | Notes |
|---|---|---|
.xlsx | Yes | Reads the first worksheet and visible cell values stored in the workbook. |
.xls | No | Legacy binary Excel files should be saved as `.xlsx` or CSV first. |
| Multiple worksheets | First sheet only | Move the sheet you need to the first tab before uploading. |
| Formulas | Cached values only | The cleaner does not recalculate workbook formulas. |
Cleanup after conversion
After the first worksheet is converted to text, the same cleanup options apply: trim cells, remove blank rows and columns, normalize headers, clean common money and date formats, and optionally make spreadsheet-dangerous values formula-safe.
Private browser workflow
- Open the CSV cleaner.
- Choose or drop an `.xlsx` file.
- Review the preview table from the first worksheet.
- Export the cleaned result as CSV.
Do not upload sensitive workbooks unless you are comfortable processing them in your browser. The tool is designed so workbook contents stay local during normal cleanup.
If a workbook depends on formulas, refresh and save it in Excel or another spreadsheet tool before converting. The cleaner reads saved cell values; it is not a spreadsheet engine and does not recalculate formulas.
Convert XLSX to clean CSV