Free Online CONSTANT_CASE Converter

CONSTANT_CASE writes identifiers in ALL CAPS with underscores between words — the universal convention for constants and environment variables.

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How to Use This Text Tool

  1. Paste your text into the input field.
  2. The CONSTANT_CASE version appears in the output panel.
  3. Click Copy to send the result to your clipboard.

What Is a CONSTANT_CASE Converter?

CONSTANT_CASE (also called SCREAMING_SNAKE_CASE) is the format every language reaches for when naming compile-time constants and environment variables: API_KEY, DATABASE_URL, MAX_RETRY_COUNT. The uppercase visually screams "do not modify" to anyone reading the code, while the underscores keep multi-word names legible.

The converter splits input on whitespace, hyphens, underscores and case boundaries, then uppercases each segment and joins them with underscores. Use it when converting human-readable phrases into .env file keys, normalising config values pulled from a spreadsheet, or generating SQL enum values from a list of human labels.

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Frequently Asked Questions

What is CONSTANT_CASE?
CONSTANT_CASE is snake_case in all uppercase (e.g., 'hello world' becomes 'HELLO_WORLD'). It is the conventional format for constants and environment variables.
When to use CONSTANT_CASE?
Use for named constants, environment variables (API_KEY, DATABASE_URL), and configuration keys. It visually signals 'do not modify' to other developers.
Why uppercase for constants?
Uppercase constants stand out in code and are a widely adopted convention across Python, JavaScript, Java, Go, and many other languages.

Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.

Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.

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