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UPPER CASE Converter
Convert your text to UPPER CASE instantly using our Case Converter tool. Free, fast, and private.
What is UPPER CASE?
UPPER CASE (also called uppercase or capital letters) is a text style where every alphabetic character is capitalized. In programming, UPPER CASE is used for constants, environment variables, and configuration keys according to the SCREAMING_SNAKE_CASE convention.
Examples
Input
hello worldUPPER CASE
HELLO WORLDDefault uppercase conversion
Input
firstNameUPPER CASE
FIRSTNAMEVariable names → constants
Input
max_file_sizeUPPER CASE
MAX_FILE_SIZEEnvironment variable formatting
Common Uses
Programming Constants
JavaScript, Python, and TypeScript use UPPER CASE for constants: const MAX_RETRIES = 3.
Environment Variables
System configuration uses UPPER CASE: NODE_ENV=production, API_KEY=xxx.
CSS Variables
CSS custom properties often use UPPER CASE category prefixes: --COLOR-PRIMARY.
Acronyms & Abbreviations
Standard formatting for acronyms: HTML, CSS, JSON, API, URL.