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Convert formats
Switch between CSV and XLSX with delimiter control.
Drag & drop your file here
Or click to browse from your device.
Automatically detects the conversion direction.
Preview
Small sample of the converted data.
How to convert CSV and XLSX without corruption
Conversion is more than file format change. Preserve delimiters, leading zeros, and the correct worksheet to avoid silent data loss.
Recommended workflow
- - Upload one source file and confirm auto-detected direction (CSV to XLSX or reverse).
- - For XLSX inputs, choose the intended sheet if multiple sheets are available.
- - Set delimiter explicitly for CSV output if your target system expects semicolon or tab.
- - Download and open the converted file in the destination application for a quick validation pass.
Quality checks before delivery
- - Confirm identifier columns still keep leading zeros.
- - Check date columns are still readable in expected format.
- - Validate delimiter choice by opening the output in the target locale/tool.
Common mistakes
- - Converting the wrong worksheet when the workbook has multiple tabs.
- - Using comma delimiter for systems configured for semicolon CSV.
- - Treating IDs as numbers and losing formatting semantics.
FAQ
Does conversion keep Excel formulas?
CSV cannot store formulas. Use XLSX output when formula preservation is required.
Which delimiter is safest?
It depends on destination locale and tool defaults. Validate on one sample import first.