Constant Case Text Converter

Constant Case Text Converter

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1 Output lines

0 Output chars

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Installable as PWA

Workflow & Usage

  1. Paste your text Add a phrase, config name, or a list (one per line).

  2. Get CONSTANT_CASE output instantly The output updates live:

  • api key v2 → API_KEY_V2
  • pricing plan enabled → PRICING_PLAN_ENABLED
  1. Copy and use it Click Copy and paste into .env files, CI/CD configs, docs, or code.

Need other formats (snake_case, kebab-case, camelCase, Slug, etc.)? Use the full Text Transformer tool.

What CONSTANT_CASE Is Good For

CONSTANT_CASE is basically a visual signal: “this is a key / flag / constant — don’t treat it like regular text.”

  • Environment variables .env and hosting dashboards love this format:

  • DATABASE_URL

  • STRIPE_SECRET_KEY

  • Feature flags and config keys Clear naming in configs, toggles, and build pipelines.

  • Constants in code Many style guides use this for values that shouldn’t change: MAX_RETRIES, DEFAULT_TIMEOUT_MS

  • API / integration settings Great for docs and setup guides when users copy-paste keys.

Examples

Common conversions

  • Hello world → HELLO_WORLD
  • API key v2 → API_KEY_V2
  • Room 12A check-in time → ROOM_12A_CHECK_IN_TIME
  • already_CONSTANT_CASE → ALREADY_CONSTANT_CASE

From separators

  • image-resizer tool → IMAGE_RESIZER_TOOL
  • product.price.usd → PRODUCT_PRICE_USD
  • userName → USER_NAME

Multi-line lists

Input:

stripe secret key
database url
default timeout ms

Output:

STRIPE_SECRET_KEY
DATABASE_URL
DEFAULT_TIMEOUT_MS

Use Cases

  • DevOps / hosting setup Convert human descriptions into env var names for Vercel, Cloudflare, Netlify, Docker, and CI.

  • Documentation Keep setup docs consistent so users don’t guess naming.

  • Teams Standardize config keys across services so everything matches.

  • Quick renaming When you’re turning product requirements into real config flags.

Tips for Best Results

  • Keep names stable Changing env var names later can break deployments. Convert once, then stick with it.

  • Avoid overly long keys CONSTANT_CASE is readable, but long chains can get ugly. Trim input when possible.

  • Numbers are fine v2, 2026, 3d all convert cleanly (V2, 2026, 3D), which is handy for versioned flags.

How It Works

  • Split into words The tool breaks your text at spaces and common separators (underscores, dashes, dots, punctuation).

  • Normalize and join It uppercases the words (where case exists) and joins them with underscores.

  • Runs locally No uploads, no tracking — just fast string conversion in your browser.

Frequently Asked Questions

CONSTANT_CASE writes words in uppercase and joins them with underscores (e.g., 'hello world' → 'HELLO_WORLD'). It’s also called SCREAMING_SNAKE_CASE.

It’s common for environment variables (API_KEY), configuration flags, and values you want to clearly mark as constants in code.

Yes. Spaces and separators (dashes, dots, extra punctuation) are treated as word breaks, then everything is joined with underscores. Numbers are kept.

Yes. Multi-line input stays multi-line, so you can convert a whole list of names (one per line) in one go.

No. Everything runs locally in your browser. Your input isn’t sent to a server, and the tool can work offline after it loads once.

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