How to use CSV and XLSX Converter
- Choose CSV to XLSX or XLSX to CSV.
- Provide the table or workbook and choose the delimiter or worksheet area.
- Download the output and check cell values in your spreadsheet app.
Example: CSV and XLSX Converter
Keep an account number as text while creating a workbook.
Options
- Conversion
- CSV to XLSX writes one text-valued worksheet. XLSX to CSV reads a selected stored rectangle; it does not calculate formulas or preserve formatting.
- Pasted CSV
- One unique, nonblank header per column. Quoted commas and line breaks are supported. Each cell may contain up to 2,000 characters.
- CSV separator
- The selected separator applies to parsing or writing CSV. Choose Tab for TSV and quote values that contain the separator or line breaks.
- XLSX worksheet number
- For workbook export, the number is one-based workbook order and includes hidden sheets. Verify the sheet you selected before sharing its data.
- XLSX rectangular area (optional)
- A1:D100 names a rectangular area. Blank uses the stored area. The first selected row becomes the header, so choose the rectangle carefully.
Supported inputs and limits
Where your input is processed
This tool processes your input in this browser. Your text and files are not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.
Text preservation avoids guessing a cell type
CSV does not declare a numeric or date type for a field. This converter retains entered values as text in the workbook rather than guessing that an identifier is a number. You can convert selected cells in your spreadsheet later if arithmetic is required. Check identifiers, empty cells and quoted line breaks after opening the actual download.
A selected workbook area has strict refusal rules
Formula cells and merged ranges inside the chosen export area are refused. CSV cannot preserve their workbook behaviour or styling, and this tool does not evaluate them. Formula protection can prefix exported strings that begin with risky characters. Inspect the CSV before importing it into another spreadsheet or an application that expects exact raw text.
Questions about CSV and XLSX Converter
Are formulas recalculated?
No. Formula cells in the selected export area are refused.
Does XLSX formatting survive as CSV?
No. CSV contains text values without workbook styling.
Why can a CSV value gain a prefix?
Formula-like values receive a text prefix to reduce spreadsheet formula execution.