csvfmt

Interactive CLI tool to convert CSV files between locale formats (EN/DE).

German Excel exports use ; as delimiter and , as decimal separator, while English exports use , and .. This tool auto-detects the source format and lets you interactively confirm and convert.

Install

go install github.com/fxsml/csvfmt@latest

Or build from source:

go build -o csvfmt .

Usage

csvfmt <input.csv> <output.csv>

The tool will:

1. Auto-detect delimiter and decimal separator
2. Walk you through confirming source format, choosing target format, and selecting which columns contain numbers
3. Preview the converted output
4. Write the result

Example

# German to English
csvfmt data_de.csv data_en.csv

# English to German
csvfmt data_en.csv data_de.csv

Supported formats

Locale	Delimiter	Decimal	Example
EN	,	.	1,234.56
DE	;	,	1.234,56
Tab	\t	either	1234.56