Local browser tool

CSV to XLSX

Create a clean Excel workbook with explicit or conservative delimiter detection.

● Selected files stay on this device

Choose CSV file

Drop a file here or browse your device

CSV delimiter

Steps

How to use CSV to XLSX

Choose a CSV.
Confirm or choose the delimiter.
Download a text-safe XLSX workbook.

Worked example

Import semicolon-separated contacts

Choose contacts.csv and Semicolon.

Result: Each parsed field becomes a text cell; values beginning with = are not executed.

Supported

What this tool handles

Comma, semicolon, tab and pipe
Quoted fields and newlines
UTF-8 Unicode

Not supported

Important limitations

Legacy encoding guesses
Multiple tables
Type inference

Operational limits

UTF-8 recommended
Maximum 25 MB, 100,000 rows and 2,000,000 cells
Formula-like values stay text

Troubleshooting

Common problems

Everything is in one column

Choose the actual delimiter.

Accents are damaged

Re-export the source as UTF-8.

Questions

CSV to XLSX FAQ

Are formulas executed?

No. Formula-like values are stored as literal text.

Will 00123 remain visible?

Cells are text-formatted to preserve identifiers.

Learn before converting

Practical guides for this task

CSV encoding, commas, semicolons and tabsDiagnose one-column imports, broken accents and quoted delimiters with a concrete CSV model.How to preserve leading zeros in CSV and ExcelKeep postcodes, account numbers and identifiers from being silently converted to numbers.