YAML to .env Converter

You have environment-specific configuration in YAML and need to convert it to .env format for Docker, Docker Compose, or a 12-factor app. Manually flattening nested YAML keys into UPPER_SNAKE_CASE environment variables is tedious.

What This Tool Does

Paste YAML and get .env output instantly. The converter flattens nested YAML keys using underscore separators, converts keys to UPPER_SNAKE_CASE, and properly quotes values that contain spaces or special characters. Download the result as a .env file.

Everything runs in your browser. Your data never leaves your device.

When to Use This

• Docker deployment — convert YAML configs to .env files for Docker Compose
• 12-factor apps — transform structured config into environment variables
• CI/CD pipelines — generate .env files from YAML configuration for deployment
• Local development — create .env files from YAML-based project configs

How Nesting Works

Nested YAML keys are flattened with underscores:

database:
  host: localhost
  port: 5432

Becomes:

DATABASE_HOST=localhost
DATABASE_PORT=5432

FAQ

Does this send my data to a server?

No. All processing happens entirely in your browser. Sensitive config values stay on your device.

How are arrays handled?

Arrays are converted to comma-separated values by default. For example, hosts: [a, b, c] becomes HOSTS=a,b,c.