Withdata DataFileConverter converts CSV files to Fixed-Width Text locally — single file, batch, or merge multiple CSV files into one Fixed-Width Text. 100% local, secure, and cross-platform.

CSV (comma-separated values) is a delimiter-separated tabular text format.

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Why Choose Withdata CSV to Fixed-Width Text Converter?

🔒 100% Local & Secure

CSV files are read and converted on your own computer. Nothing is uploaded to any cloud server.

⚡ Fast Streaming Conversion

Large CSV files are processed in streaming mode with low memory usage — millions of rows within a minute.

📁 Batch & Merge

Batch convert many CSV files to Fixed-Width Text files, or merge multiple CSV files into one Fixed-Width Text.

🔄 Column Widths, No Delimiter

Define the width of every column (N columns need N-1 widths). No delimiter and no quoting are needed.

🖥 Windows, macOS, Linux

Native builds for Windows, macOS and Linux, with a step-by-step GUI wizard and a command line interface.

⏱ CLI & Scheduled Tasks

Save a conversion session and run it automatically from Windows Task Scheduler or crontab.

Full Feature Comparison

Feature	Supported details
Input source	Local CSV, batch CSV, merged CSV, URL / cloud CSV
Output format	Fixed-width text with detected or custom column widths
Conversion mode	Single file · merge many CSV files into one Fixed-Width Text · batch (one to one)
Running mode	GUI wizard · command line · scheduled tasks
Source options	Delimiter, quote character, header row, start row, encoding
Output options	Column mapping, encoding, date format, empty value handling
Platform	Windows, macOS, Linux (native, 64-bit)

All CSV to Fixed-Width Text Conversions You Need

Single CSV file → Fixed-Width Text file, step by step in the GUI wizard
Batch convert multiple CSV files → multiple Fixed-Width Text files
Merge multiple CSV files into one Fixed-Width Text — merge tool
Convert CSV to Fixed-Width Text in the command line, and run it as a scheduled task
All CSV conversion tools and all Fixed-Width Text conversion tools

CSV to Fixed-Width Text Notes

The delimiter and quote character can be chosen (comma, semicolon, tab, pipe or custom).
Quoted fields and embedded line breaks are parsed correctly.
The first row can be used as the column header (optional); leading rows can be skipped.
The encoding is detected automatically and can be overridden.
Output column widths are detected from the data (measured width + 15% slack, at least 2 and at most 15 extra characters), or set manually.

How to Convert CSV to Fixed-Width Text (4 Steps)

Open Withdata DataFileConverter and select CSV as the input type and Fixed-Width Text as the output type.
Load your CSV data — a single file, a folder / list of files for batch conversion, or several files to merge into one.
Check the preview table, then adjust the source options and the output options.
Click Convert — the Fixed-Width Text output is written in seconds. Save the session if you want to run it again from the command line.