UPPERCASE Converter
Make every letter UPPERCASE instantly.
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When to use UPPERCASE
- Acronyms and initialisms: NASA, HTML, API, URL
- SQL keywords: SELECT, FROM, WHERE, INSERT
- Constants in code: MAX_VALUE, DEFAULT_TIMEOUT
- Headings and titles in some design styles
- Emphasis in informal text (use sparingly)
- Spreadsheet headers for clarity
Accessibility note: Avoid using UPPERCASE for long passages of body text. Research on readability shows that all-caps text is significantly harder to read than mixed case, because the uniform letter heights remove the word-shape cues readers rely on for fast recognition.
UPPERCASE in programming
Many style guides use UPPERCASE (also called SCREAMING_SNAKE_CASE when combined with underscores) for constants — values that don't change during program execution. Examples: MAX_CONNECTIONS = 100, API_BASE_URL = "https://...".
Frequently asked questions
Yes. This converter uses JavaScript's built-in toUpperCase() which handles Unicode correctly. É → É, ü → Ü, ñ → Ñ, and so on for all Latin-script languages.
In Microsoft Word: select text and press Shift+F3 to cycle through UPPERCASE, lowercase, and Title Case. In Google Docs: Format → Text → Capitalisation. On Mac: there is no built-in shortcut in most apps, but this tool is faster for large amounts of text.