このツールとは？
The case converter changes English text to all uppercase, all lowercase, or title case (first letter of each word capitalized).
なぜ使う？
Useful when unifying headings, labels, or code style, or when fixing mixed-case text.
使い方
Enter or paste English text, then choose the conversion type (uppercase, lowercase, title, etc.). Copy the result.
Non-English characters are left unchanged. Processing is done only in the browser.