Will it stop Excel mangling my dates?

Converting to a real workbook first means the values are written as data rather than re-guessed by Excel's import wizard on every open, which is where most silent corruption comes from.

Does this need the 400 MB document engine?

No. The spreadsheet and data paths are handled directly, so nothing is downloaded for this conversion.

How large a CSV can it handle?

There is no cap imposed by BizTray. Very large files are limited only by your machine, and by the row limit of whatever opens the resulting workbook.

Are my files uploaded?

No. Everything runs locally — relevant, given how often a CSV export is financial data.

Free converter

CSVExcel

CSV to Excel Converter

Opening a CSV directly in Excel is where postcodes lose their leading zeros and dates silently become something else. Converting it properly first produces a real workbook with the values intact — done locally, in batches, at no cost.

Download for Windows

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

Drop in your files — One .xlsx workbook per CSV, in the folder you choose.

Why convert

Why convert CSV to Excel?

CSV is just text with commas: no types, no formatting, no formulas, no second sheet. Excel's own import wizard guesses at what each column means and is often wrong in ways nobody notices until later. A proper conversion gives you a workbook to build on.

An export from a bank, shop or database arrived as CSV and you need to work with it properly.
Excel keeps stripping leading zeros from IDs, postcodes or phone numbers.
Dates are being reinterpreted into the wrong format on open.
You have a folder of CSV exports to convert in one pass.

How it works

Convert CSV to Excel in a few clicks

1
Open Office Converter
Choose it from the tray. Tabular conversions like this one need no engine download.
2
Add your CSV files
One file or a whole folder — there is no row limit or size cap.
3
Pick XLSX as the target
Choose the output format from the target list.
4
Convert
Set the output folder and run. The CSV originals are left as they are.

The details

CSV to Excel, at a glance

Input: CSV, including semicolon and tab-separated variants
Output: XLSX, readable by Excel, LibreOffice, Numbers and Google Sheets
Delimiters: Detected automatically, with quoted fields and embedded commas handled
Encoding: UTF-8 preserved, so accented and non-Latin text survives
Engine download: None — the tabular paths do not need the document engine
Limits: No row cap, no file-size cap, no watermark

Questions