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CSVXLSX

CSV to XLSX Converter

XLSX is the modern Excel format — typed cells, multiple sheets, real formatting. Converting your CSV into one gives you something to actually build on, and BizTray does it locally with no row limit and nothing uploaded.

Windows 10/11 (x64) · Free · No account

Drop in your files — One .xlsx per CSV, written where you choose.

Why convert

Why convert CSV to XLSX?

A CSV cannot hold a second sheet, a formula, a column width or a number format. Converting to XLSX turns a flat export into a workbook — and stops the import guesswork happening again every time the file is opened.

  • A raw export needs to become a workbook you can format and extend.
  • You want to add sheets, formulas or charts to exported data.
  • Something downstream requires XLSX specifically rather than CSV.
  • A batch of CSV exports should all become workbooks in one run.

How it works

Convert CSV to XLSX in a few clicks

  1. 1

    Open Office Converter

    Choose it from the tray — no download needed for this path.

  2. 2

    Add the CSV files

    One or a whole folder; row count and file size are uncapped.

  3. 3

    Select XLSX

    Pick it as the target format.

  4. 4

    Convert

    Choose an output folder and run it.

The details

CSV to XLSX, at a glance

Input
CSV, including semicolon and tab-separated files
Output
XLSX, opening in Excel, LibreOffice, Numbers and Google Sheets
Delimiter detection
Automatic, with quoted fields handled correctly
Encoding
UTF-8 preserved end to end
Engine download
None
Limits
No row cap, no size cap, no watermark

Questions

CSV to XLSX Converter, answered

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Convert something else

Convert CSV to XLSX — free

It's one tool inside BizTray, alongside the PDF Organizer, PDF Tools, and Fill & Sign. One small download, no account.

Windows 10/11 (x64) · Free · No account

Local, private, no watermark.