Spreadsheets & data
Convert CSV to Excel Online — Free
Get a proper Excel spreadsheet (.xlsx) from your CSV — column types auto-detected, no more 'opens as text' frustration in Excel.
- No signup to try
- Sandboxed processing
- Files deleted in 24 h
What this does
- Auto column-type detection (numbers stay numbers, dates stay dates)
- First row treated as headers
- UTF-8 CSV fully supported
How it works
- 1
Upload your CSV
Drop it above, or click to pick from your device. We validate the format immediately — no spinning on a file we can't process.
- 2
Run the conversion
The recipe runs in an isolated cloud sandbox — same as every other ReFile job. No AI guessing involved; it's a hand-written command that does one thing.
- 3
Download the XLSX
Result lands in seconds. Files auto-delete from our servers after 24 hours; signed download URLs expire in the same window.
Frequently asked
- What if my CSV uses semicolons?
- LibreOffice auto-detects the delimiter. Comma, semicolon, and tab all work.
- Will dates be detected?
- ISO dates (2024-01-15) and common locale formats yes. Ambiguous formats (01/02/03) may be guessed differently — disambiguate with ISO if it matters.