Convert Excel to CSV
This tool converts an Excel workbook (.xlsx) to CSV in your browser. A workbook can hold several sheets where a CSV holds only one table, so every sheet with values becomes its own CSV file, numbered by its position in the workbook. Numbers and text come out exactly as the file stores them, a date becomes an ISO date, and a formula contributes the value Excel last computed for it. Your file is never uploaded.
Runs in your browser
Drop a file here
XLSX, up to 50 MB
How it works
- 1 Choose an Excel (.xlsx) file.
- 2 Set the delimiter if the result should not use a comma.
- 3 GRID16 reads every sheet in your browser.
- 4 Download one CSV per sheet that has values.
Questions
- What happens with a workbook that has several sheets?
- Every sheet that holds at least one value becomes its own CSV file, numbered by its position in the workbook. An empty sheet, which old Excel defaults often leave behind, is skipped.
- How are numbers and dates written?
- Exactly as the file stores them. A number keeps its stored digits instead of a rounded display value, and a date becomes an ISO date such as 2026-09-14, or 2026-09-14 13:45:00 when it carries a time.
- What does a formula give?
- The value Excel last computed for it. A formula is not recalculated, and a cell whose formula errored comes out empty.
- Does it read the older .xls format?
- No. Only the newer .xlsx format is read; a legacy .xls file is not recognized.
- Is my file uploaded to a server?
- No. The conversion happens in your browser; the file never leaves your device.