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テキストケース変換

UPPERCASE、lowercase、Title Case、Sentence case、camelCase、snake_caseに変換します。

What is Text Case Converter?

Text Case Converter is a free online tool that transforms text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, and snake_case instantly. It is useful for normalizing code identifiers, formatting headings, or fixing text pasted from different sources.

How to use

  1. Paste or type your text into the input box.
  2. Click the desired case conversion button (UPPER, lower, Title, Sentence, camelCase, snake_case).
  3. The output appears instantly. Use the Copy button to copy it to your clipboard.

Notes

  • camelCase joins words and capitalizes each word after the first (e.g. myVariableName).
  • snake_case joins words with underscores and lowercases everything (e.g. my_variable_name).
  • Title Case capitalizes the first letter of every word.

FAQ

What is the difference between Title Case and Sentence case?
Title Case capitalizes the first letter of every word. Sentence case only capitalizes the first letter of the first word, treating the rest as normal sentence text.
Can I convert code variable names?
Yes. camelCase and snake_case conversions split text by spaces and punctuation, making them useful for renaming variables or function names.
Does it handle non-English characters?
UPPERCASE and lowercase use the browser's built-in toUpperCase() and toLowerCase(), which support most Unicode characters including accented letters.

概要

テキストを大文字・小文字・タイトルケース・文頭大文字へ変換します。見出し統一やラベル整形に便利です。

使い方

  1. 変換したいテキストを貼り付けます。
  2. 変換先のケース形式を選択します。
  3. 結果をコピーして利用します。

使用例

補足

よくある質問

記号は保持されますか？
はい。文字の大小のみ変更し、記号は保持します。
日本語混在でも使えますか？
使えますが、言語固有の大文字規則は英語ほど厳密ではありません。
一括変換できますか？
複数行をまとめて貼り付けて変換できます。
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