Withdata DataFileConverter converts Excel workbooks (*.xlsx) to YAML locally — single file, batch, or merge multiple Excel files into one YAML. No Microsoft Excel installation is required. 100% local, secure, and cross-platform.

An Excel workbook contains one or more worksheets.

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Why Choose Withdata Excel to YAML Converter?

🔒 100% Local & Secure

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

⚡ Fast Streaming Conversion

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

📁 Batch & Merge

Batch convert many Excel files to YAML files, or merge multiple Excel 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 Excel workbook (`*.xlsx`), batch workbooks, selected worksheets
Output format	YAML with configurable indent (default 2) and flow style
Conversion mode	Single file · merge many Excel files into one YAML · batch (one to one)
Running mode	GUI wizard · command line · scheduled tasks
Source options	Worksheet selection, header row, start row
Output options	Column mapping, encoding, date format, empty value handling
Platform	Windows, macOS, Linux (native, 64-bit)

All Excel to YAML Conversions You Need

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

Excel to YAML Notes

A workbook can contain several worksheets; you choose which ones to read.
Microsoft Excel does not have to be installed.
Optionally, each worksheet can be written to a separate output file.
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 Excel to YAML (4 Steps)

Open Withdata DataFileConverter and select Excel as the input type and YAML as the output type.
Load your Excel 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.

Convert Excel to YAML in GUI

In GUI mode the conversion is a step-by-step wizard: choose the Excel source, choose the YAML destination, check the preview, and click Convert. See Withdata DataFileConverter.