Free converter
CSVXLSXCSV to XLSX Converter
The modern Excel format, written directly rather than via Excel itself. XLSX is a zipped XML workbook — DataTray writes one properly, with your column types intact and multiple sheets if you want them.
Windows 10/11 (x64) · Free · No account
Drop in your files — Output lands in DataTray's folder with a dated name, never overwriting anything.
Why convert
XLSX, and what it gets you
XLSX replaced the old binary .xls format and is what every current version of Excel, LibreOffice and Google Sheets reads natively. It holds types properly, so a column marked as text stays text — which is exactly what a CSV cannot express and why the conversion is worth doing deliberately.
- Producing a workbook for someone on a current version of Excel.
- Converting several CSVs into one workbook with a sheet each.
- Handing off data with the types recorded, rather than re-guessed on every open.
- Batch-converting an export folder on a schedule.
How it works
Convert CSV to XLSX in a few clicks
- 1
Add your CSV files
One, several, or a whole folder. Mixed delimiters across files are fine — each is detected separately.
- 2
Choose one workbook or many
Convert each file to its own .xlsx, or combine them into a single workbook with one sheet per source.
- 3
Run it
The batch runs as one job per file, and nothing writes over an existing output.
The details
CSV to XLSX, at a glance
- Output format
- .xlsx (Office Open XML)
- Sheets
- One per file, or one file per sheet — your choice
- Types
- Explicit per column, so text stays text
- Batch
- Whole folders in a single run
Questions
CSV to XLSX Converter, answered
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Convert something else
Convert CSV to XLSX — free
Converting more than one file? Data Converter does whole folders at once, on your own machine.
Windows 10/11 (x64) · Free · No account
Runs on your own machine · No upload · No watermark