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lowercase to CONSTANT_CASE Converter

Convert lowercase text to CONSTANT_CASE — one line or a whole list at once.

To convert lowercase to CONSTANT_CASE, paste your text above and the result updates as you type. user account id becomes USER_ACCOUNT_ID. Word boundaries are detected from the existing casing, so an identifier does not need separators to be split correctly. CONSTANT_CASE marks compile-time constants and environment variables across nearly every language.

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About converting LOWERCASE to CONSTANTCASE

Lowercasing is how you normalise text before comparing it — though for user-facing comparisons, locale matters: Turkish dotted and dotless i famously break naive lowercasing. CONSTANT_CASE marks compile-time constants and environment variables across nearly every language. Converting lowercase to CONSTANT_CASE turns user account id into USER_ACCOUNT_ID; acronyms are the awkward case in every direction, since "userID" and "userId" split differently and only one of them round-trips.

Convert CONSTANTCASE to LOWERCASE insteadOpen the full Case Converter

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