Fast, free, and privacy-friendly
About This CSV to Excel Tool
Turn CSV files into real .xlsx workbooks while preserving columns, text encoding, leading zeros, and data structure.
Why this tool exists
CSV files often break in Excel because encoding, delimiters, dates, leading zeros, and long numbers are guessed too aggressively. This project focuses on a narrower goal: converting CSV into a usable Excel workbook without distorting the original data.
What it solves
- Dates open incorrectly in Excel
- Leading zeros disappear from ZIP codes and IDs
- Long numbers turn into scientific notation
- Columns split the wrong way
- Japanese or Chinese text becomes garbled
- CSV opens, but it's still not a real Excel workbook
Product principles
Protect leading zeros
ZIP codes, IDs, order numbers, and account numbers are kept exactly as-is — no unwanted numeric conversion.
Fix garbled text
Handles UTF-8, Shift-JIS, GBK, UTF-16, and other common encodings so your Chinese or Japanese text stays readable.
Keep columns aligned
Auto-detects commas, tabs, and semicolons. Preview the result before downloading — adjust if anything looks off.
Download a real .xlsx file
Get an actual Excel workbook — not just a renamed CSV — ready for formulas, filters, and frozen headers.