Upper and Lowercase Conversion(大文字・小文字変換) is a developer tools chrome extension. it's a free extension , it has 16 active users since released its first version, it earns an average rating of 1.00 from 1 rated user, last update is 3277 days ago.
使用方法:ウェブページで変換したい英字をドラッグして選択中にエンターキーを押下すると大文字と小文字に変換された文字がテキストフィールドに表示されます。
You could download the latest version crx file or older version files and install it.
日本語.
100% user give 1-star rating. Read reviews of upper and lowercase conversion(大文字・小文字変換)
You could find more help information from upper and lowercase conversion(大文字・小文字変換) support page.
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Does not seem to wrok well with English.