XLSX to YAML Converter [2025]

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Transform Excel spreadsheets into clean YAML data. Perfect for configuration files, data modeling, and application development.

✓ Smart Formatting✓ Array/Object Modes✓ Date Support

Output Formats

Array Mode

Convert rows to array items with named properties:

data:
  - # Row 1
    name: John Doe
    age: 30
    city: New York
  - # Row 2
    name: Jane Smith
    age: 25
    city: London

Object Mode

Convert rows to named objects:

data:
  row_1:
    name: John Doe
    age: 30
    city: New York
  row_2:
    name: Jane Smith
    age: 25
    city: London

Key Features

  • Convert Excel data to clean, well-structured YAML format
  • Choose between array-based or object-based output structures
  • Smart handling of dates with ISO-8601 formatting
  • Automatic value quoting when needed for YAML compatibility
  • Customizable root key name for flexible integration
  • Support for large Excel files up to 10MB
  • Browser-based processing for data privacy
  • One-click copy and download functionality

Common Use Cases

Configuration

  • • App settings
  • • Environment vars
  • • Build configs
  • • Deploy scripts

Data Modeling

  • • API schemas
  • • Test fixtures
  • • Sample data
  • • Mock responses

Development

  • • CI/CD pipelines
  • • Docker configs
  • • Static data
  • • Documentation

Value Handling

Smart Quoting

Values are automatically quoted when they:

  • Contain special characters
  • Look like numbers but are strings
  • Have leading/trailing whitespace
  • Include YAML reserved characters

Special Types

Special value handling for:

  • Dates (ISO-8601 format)
  • Empty cells (null values)
  • Boolean values
  • Numeric data

Frequently Asked Questions

Which output format should I choose?

Array mode is ideal when your data represents a collection of similar items. Object mode is better when each row has a unique identifier or when you need to reference specific rows by name in your application.

How are dates handled?

When date formatting is enabled, Excel dates are automatically converted to ISO-8601 format (e.g., "2025-01-30T08:30:00Z"). This ensures consistent date representation across different systems and applications.

Why quote certain values?

Values are quoted when they might be ambiguous or cause parsing issues in YAML. For example, numbers that should be treated as strings or text containing special characters. You can also enable "Quote All Values" for consistent formatting.

Is my data secure?

Yes, all processing happens entirely in your browser. No data is sent to any server, ensuring your Excel data remains private and secure throughout the conversion process.

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