Leading zeros
ZIP codes, SKUs, phone values, and reference numbers may be interpreted as numbers.
CSV to Excel Converter
Convert one CSV file into a single-sheet XLSX workbook. Learn how delimiters, UTF-8 encoding, dates, leading zeros, and long numbers are interpreted.
How to use this tool
- Select one CSV file.
- Confirm its delimiter and encoding.
- Convert the file to XLSX.
- Download and open the workbook.
- Verify columns, accents, dates, leading zeros, and long numbers.
Turn one plain CSV table into a simple Excel workbook. The output has one worksheet and no inferred formulas or advanced styling.
Delimiter handling
Standard comma-separated input is safest; regional semicolon formats may appear in one column.
Automatic interpretation
Excel may reinterpret date-like text and large numeric strings.
Before and after example
Before
- customers.csv → Name, ZIP Code, Status
- Rows contain ZIP codes 00125 and 00908
After
- customers.xlsx → one worksheet
- Verify ZIP Code remains text, not 125 and 908
Troubleshooting
Everything is in one column
Re-export using a standard comma delimiter.
Accents are broken
Convert the source file to UTF-8.
Leading zeros disappear
Format identifiers as text.
Large numbers use scientific notation
Format the column as text or use an import workflow with explicit types.
Frequently asked questions
Does it add formulas or styling?
No. It creates a simple worksheet.
Can I convert many CSV files?
Use the Merge CSV Files page.
How many sheets are created?
One.
Is the CSV uploaded?
No. Conversion runs in the browser tab.
Why is everything in one column?
The source delimiter may not be a comma.
Can Excel change dates automatically?
Yes. Review date-like text after opening.
Related spreadsheet tools
- Merge CSV Files — Combine several CSV files into XLSX.
- Excel to CSV Converter — Export the first Excel worksheet.
- Merge Excel Files — Combine spreadsheet and CSV sources.