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

HTML files contain one or more tables.

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Why Choose Withdata HTML to Fixed-Width Text Converter?

🔒 100% Local & Secure

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

⚡ Fast Streaming Conversion

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

📁 Batch & Merge

Batch convert many HTML files to Fixed-Width Text files, or merge multiple HTML 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 HTML files, batch HTML files, merged HTML files
Output format	Fixed-width text with detected or custom column widths
Conversion mode	Single file · merge many HTML files into one Fixed-Width Text · batch (one to one)
Running mode	GUI wizard · command line · scheduled tasks
Source options	Table selection, encoding
Output options	Column mapping, encoding, date format, empty value handling
Platform	Windows, macOS, Linux (native, 64-bit)

All HTML to Fixed-Width Text Conversions You Need

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

HTML to Fixed-Width Text Notes

The tables in an HTML file are detected; you choose which table to read.
When writing HTML output, a template file can be used to control the layout.
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 HTML to Fixed-Width Text (4 Steps)

Open Withdata DataFileConverter and select HTML as the input type and Fixed-Width Text as the output type.
Load your HTML 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.