Text Case Converter
Switch text between UPPERCASE, lowercase, Title Case, Sentence case, and more — then copy. Everything runs in your browser.
データ収集なし
データベースもアカウントもありません。ファイルを見ることはできません。
超高速
ブラウザネイティブ処理 — アップロードなし、待ち時間なし。
100%無料
制限なし、透かしなし、隠れた費用なし。
アカウント不要
サインイン？不要です。ツールを開くだけで使えます。
Which case should you use?
The common cases
UPPERCASE shouts — good for short labels, avoid for body text. lowercase is casual and modern. Title Case capitalizes the important words and is standard for headlines. Sentence case capitalizes only the first word (and proper nouns) and reads naturally for UI and long text.
Capitalize Each Word makes every word start with a capital, which is handy for names and lists but less correct for true titles, where small words like 'of' and 'the' stay lowercase.
Smart Title Case
This tool's Title Case keeps minor words (a, an, the, of, to, and…) lowercase unless they're the first or last word — the convention most style guides follow.
Frequently asked questions
Does Title Case lowercase small words?
Yes — articles and short prepositions stay lowercase unless they start or end the title.
Can I chain conversions?
Yes. Each button transforms the current text, so you can convert then re-convert.
Is there a length limit?
No practical limit — it all runs in your browser.
Is my text uploaded?
No. Conversion happens locally; nothing is sent to a server.