無料ツール 6 個。計算はすべてブラウザ内で完結。
Characters, words, lines and reading time.
Format or minify JSON with error position.
Convert text to and from Base64, UTF-8 safe.
Percent-encode or decode query strings.
Generate passwords locally; nothing is uploaded.
Contrast ratio and WCAG AA/AAA compliance.
すべての計算はブラウザ内で完結し、入力内容は送信されません。