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

HTML files contain one or more tables.

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Why Choose Withdata HTML to YAML 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 YAML files, or merge multiple HTML files into one YAML.

🔄 Nested YAML → Dotted Columns

Nested mappings become address.city-style column names; sequences and block scalars are expanded automatically.

🖥 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	YAML with configurable indent (default 2) and flow style
Conversion mode	Single file · merge many HTML files into one YAML · 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 YAML Conversions You Need

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

HTML to YAML 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.
The output indent can be set (2 spaces by default).
Flow style ({ } / [ ]) can be enabled or disabled.
Dotted column names can be written back as nested YAML mappings.

How to Convert HTML to YAML (4 Steps)

Open Withdata DataFileConverter and select HTML as the input type and YAML 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 YAML output is written in seconds. Save the session if you want to run it again from the command line.