CSV to Fixed-Width Converter - Positional File Generator

Convert CSV to fixed-width positional format. Generate COBOL-compatible files for mainframes and legacy systems. Browser-based.

Drop CSV file here or click to browse

.csv data files

CSV Input

Column	Width	Align	Pos
Total Length	0

Fixed-Width Output

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Frequently Asked Questions

Fixed-width files have columns at exact character positions. Each field occupies a specific number of characters, padded with spaces. Used in mainframes and COBOL systems.

After loading your CSV, set the width for each column. The tool suggests widths based on your data, but you can adjust for your target system's requirements.

Data is truncated to fit the specified width. A warning shows which fields were truncated. Increase the width to preserve full values.

Text fields are left-padded (right-aligned spaces), numbers are right-padded (left-aligned spaces) by default. You can change alignment per column.

No. All conversion happens locally in your browser. Your data never leaves your device, ensuring complete privacy for sensitive information.

The tool shows the character positions for each field. You can use this information to create COBOL copybook definitions manually.

Numbers are formatted as-is. For specific decimal formats or leading zeros, pre-format your data in the CSV before converting.

Output uses standard line endings (LF). For mainframe compatibility (EBCDIC), you may need additional encoding conversion.

Yes. The converted output shows in the preview with a ruler indicating column positions. Verify alignment before downloading.

No hard limit, but mainframe systems often have 80 or 132 character limits. The tool shows total record length to help you stay within limits.

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