CSV to Excel

Convert CSV files to formatted Excel workbooks (.xlsx). Processed entirely in your browser for 100% data privacy and zero fil

Your files never leave your device. Processed locally. 100% private.

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How To Use CSV to Excel

Complete your task perfectly in just three straightforward steps.

1

Upload CSV

Drop your CSV file.

2

Customize Formatting

Freeze headers, auto-fit columns and apply table style.

3

Download

Download the Excel file.

FAQ

Everything you need to know about the CSV to Excel.

Are numbers formatted as Excel numbers?

Yes — numeric columns are auto-detected and formatted correctly.

Can I convert multiple CSVs to one workbook?

Yes — each CSV becomes its own sheet.

Is my file uploaded?

No. Everything runs locally in your browser.

File size limit?

Process files up to the browser memory limit.

Are date columns formatted as dates?

Yes — detected date columns are set to Excel date format.

Is the conversion private? Is my data sent to a server?

Your CSV data never leaves your device. The entire conversion runs in your browser using PapaParse and SheetJS. No file content, column names, or row data is transmitted to any server. When you close the tab, all data is cleared from memory immediately.

Can I convert multiple CSV files at once?

Currently the tool converts one CSV file per run. For bulk conversion of many files, you can open multiple browser tabs — each tab runs its own independent conversion. Batch conversion with a ZIP output is on the roadmap for Refinata Pro.

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