AP タイトルケース変換
APスタイル（AP通信）に従って見出しを大文字化：4文字以上の単語は先頭大文字、短い前置詞・冠詞は小文字に
入力テキスト
フォーマット結果
AP Style Capitalization Rules
Four Letters or More
AP capitalizes all words of four or more letters, including prepositions like "with", "from", and "over".
the Mayor Announces With New Plan
Verbs Are Always Capitalized
No matter how short: is, are, be, and go are always capitalized in AP headlines.
Why Is the Sky Blue in Winter
First and Last Word
The first and last words of a headline are always capitalized, even articles and short prepositions.
The Story of a City
なぜ AP タイトルケース変換 を選ぶのか？
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Official AP Stylebook Rules
Implements the Associated Press headline capitalization rules used by newsrooms: capitalize principal words, all words of four or more letters, and every verb regardless of length.
Real-Time Preview
See your headline converted to AP title case as you type. Perfect for headlines, subheads, and social posts under deadline.
Privacy Focused
All conversion happens locally in your browser. Unpublished headlines never leave your device.
仕組み
AP title case をプロのように処理する簡単なステップ
Enter Your Headline
Type or paste your headline, subhead, or title.
Automatic Conversion
AP Style rules are applied instantly — no settings needed.
Review the Result
Check the AP-capitalized headline in the output editor.
Copy & Publish
Copy the result and use it in your article or post.
プロフェッショナルな AP Title Case Converter フォーマッター＆バリデーター
AP Title Case processing runs entirely in your browser — no uploads, no accounts, no limits.
This AP Title Case Converter applies the Associated Press Stylebook headline capitalization rules that newsrooms and journalists rely on. Paste any headline and get publication-ready AP capitalization instantly.
AP style capitalizes the principal words of a headline — nouns, pronouns, verbs, adjectives, and adverbs — plus every word of four or more letters. Short words (three letters or fewer) such as articles, conjunctions, and short prepositions are lowercased unless they are the first or last word of the headline. Verbs are always capitalized, even short ones like "is" and "be".
Widely used by journalists, editors, PR professionals, and content writers for news headlines, press releases, subheads, captions, and social media posts where AP Style compliance is expected.
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よくある質問
Ap Title Case フォーマットに関するよくある質問
AP title case is the headline capitalization style defined by the Associated Press Stylebook. It capitalizes principal words and all words of four or more letters, while lowercasing short articles, conjunctions, and prepositions (three letters or fewer) unless they are the first or last word.
Articles (a, an, the), coordinating conjunctions (and, but, or, for, nor), and short prepositions (at, by, in, of, on, to, up, as) of three letters or fewer stay lowercase — unless they are the first or last word of the headline.
Yes. AP style capitalizes verbs of any length, including very short ones like "is", "are", "be", and "go". This is one of the most common mistakes when capitalizing headlines by hand.
Words of four or more letters are always capitalized in AP style, including prepositions like "with", "from", "over", and "into".
AP capitalizes words of four or more letters and all verbs. Chicago traditionally lowercases all prepositions regardless of length. APA lowercases only short words (fewer than four letters) that are articles, conjunctions, or prepositions. Each style also differs in handling hyphenated compounds and words after colons.