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Constant Case Converter — Free Online Tool

Last updated: January 2025

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What is Constant Case Converter?

CONSTANT_CASE (also called SCREAMING_SNAKE_CASE) converts text to ALL_UPPERCASE_WITH_UNDERSCORES.

When to use Constant Case Converter?

Use CONSTANT_CASE for environment variables (.env files), PHP constants, Python constants, and configuration keys.

How to use this tool

  1. 1Paste your text
  2. 2Click 'Convert' to get CONSTANT_CASE
  3. 3Copy for your constants and environment variables

Examples

InputOutput
database hostDATABASE_HOST
apiKeyAPI_KEY
max retry countMAX_RETRY_COUNT
background-colorBACKGROUND_COLOR
Hello WorldHELLO_WORLD

Rules & Behavior

  • All words are UPPERCASE
  • Words are separated by underscores (_)
  • This is essentially snake_case in all caps

Related Tools

Snake Case ConverterUppercase ConverterConstant Case ConverterCobol Case Converter

Frequently Asked Questions

What is CONSTANT_CASE?

CONSTANT_CASE (also called SCREAMING_SNAKE_CASE or UPPER_SNAKE_CASE) uses all uppercase letters with underscores between words. Example: MAX_RETRY_COUNT.

When should I use CONSTANT_CASE?

Use it for constants in Python (MAX_VALUE), PHP (define('MAX_VALUE', 100)), environment variables (DATABASE_URL), and configuration keys.

Why is it called SCREAMING_SNAKE_CASE?

Regular snake_case is quiet (lowercase). SCREAMING_SNAKE_CASE shouts (uppercase). The 'screaming' metaphor comes from all-caps text appearing like shouting in text communication.

Is it the same as snake_case?

They use the same structure (underscores between words) but CONSTANT_CASE is all uppercase while snake_case is all lowercase.

Can I convert from camelCase to CONSTANT_CASE?

Yes, the tool detects camelCase boundaries and converts them correctly.