CSV to Excel Converter
Convert one or more CSV files into a single .xlsx workbook — each CSV becomes its own sheet.
Quick answer: Convert one or more CSV files into a single .xlsx workbook — each CSV becomes its own sheet.
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Frequently asked questions
- Why combine multiple CSVs into one workbook?
- Cleaner deliverable, easier to send by email, and the natural format for an Excel power-user. Recipients can switch between sheets to compare data sets.
- How are types detected?
- We let SheetJS infer types — numbers stay numbers, dates stay dates, everything else is text. For exact control over types, prepare the CSV with consistent formats first.
- Will Excel open it without warnings?
- Yes — the output is a valid .xlsx written with SheetJS, which is what countless production tools (including Replit's own export pipelines) use.
- Are my files uploaded?
- No — both parsing and workbook building run in your browser.
- What if the CSVs have different column structures?
- That's fine — each CSV becomes its own sheet, so they don't need to share columns. The workbook just becomes a collection of independent tables.