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YouTubeダウンローダー","無料のオンライン4K YouTubeダウンローダー。YouTube動画を2160pウルトラHD、1440p、1080p、利用可能な場合は8Kでブラウザから直接保存できます。インストール不要。","4K YouTubeダウンローダー - YouTube動画を4Kでオンライン保存","4k youtubeダウンローダー",[355,356,357,358,359],"youtube 4k ダウンローダー","youtube 4k ダウンロード","youtube 2160p ダウンロード","ウルトラhd youtube ダウンローダー","8k youtube ダウンローダー","tool","youtube","/seo/images/video-download-flow-illustration.webp","YouTubeリンクが処理され、4KウルトラHDのダウンロード選択肢として表示されるブラウザの流れ。","4K対応のYouTubeリンクを貼り付け、デバイスに合わせて2160p、1440p、または1080pを選択します。","/seo/screenshots/any4k-youtube-video-downloader.webp",[367,370,373,376],{"name":368,"text":369},"YouTubeのURLをコピーする","ブラウザまたはアプリでYouTube動画を開き、共有リンクまたはアドレスバーのURLをコピーします。",{"name":371,"text":372},"リンクをAny4Kに貼り付ける","any4k.comで、YouTubeのURLを入力欄に貼り付けて解析を開始します。",{"name":374,"text":375},"4K形式を選ぶ","ソース動画が4Kに対応している場合は、2160p（または1440p／1080p）と、お使いのプレーヤーに合うコンテナを選びます。",{"name":377,"text":378},"ファイルを保存する","ダウンロードを確定し、高解像度の動画をデバイスのストレージに保存します。",[380,382,384,386],{"title":381,"path":313},"YouTube動画ダウンローダー",{"title":383,"path":312},"YouTubeをMP4に変換",{"title":385,"path":309},"YouTube Shortsダウンローダー",{"title":387,"path":4},"4Kダウンローダー：オンライン版とソフトウェア版",[389,392,395,398,401],{"question":390,"answer":391},"4K YouTubeダウンローダーとは何ですか？","4K YouTubeダウンローダーとは、ソース動画が2160p（ウルトラHD）以上の画質でアップロードされている場合に、その画質でYouTube動画を保存できるツールのことです。Any4Kはブラウザ上で動作し、送信した動画についてYouTubeが提供する最高解像度をリストアップします。",{"question":393,"answer":394},"一部の動画で4Kオプションが表示されないのはなぜですか？","YouTubeは、投稿者が元の動画を2160p以上でアップロードした場合にのみ4Kを配信します。古い動画、ライブ配信、モバイルからのアップロードの多くは1080pが上限です。リストに4Kがない場合は、ソース自体に4Kストリームがないということです。",{"question":396,"answer":397},"4Kダウンロードは時間とストレージを多く使いますか？","はい。4K動画ファイルは通常、同じ動画の1080p版に比べて3〜5倍のサイズになります。そのためダウンロードに時間がかかり、ディスク容量も多く消費します。短いクリップでも数百メガバイト、長い動画なら数ギガバイトを見込んでください。",{"question":399,"answer":400},"8Kでダウンロードできますか？","YouTubeへの元のアップロードに8Kストリーム（4320p）が含まれている場合、Any4Kはそれをダウンロード選択肢として表示できます。8Kが利用できることは稀で、ほとんどの投稿者は1080pまたは最大でも4Kでアップロードしています。",{"question":402,"answer":403},"スマートフォンで4Kファイルを再生できますか？","最新のフラッグシップスマートフォン（iPhone 12以降、近年のAndroidフラッグシップ）では4Kがスムーズに再生できます。古いデバイスでは再生に問題が出る場合があります。デバイスが古い場合は、1440pまたは1080pを選んでください。小さな画面でも十分シャープに見えます。",{"type":405,"children":406,"toc":554},"root",[407,415,422,427,432,438,443,448,454,490,495,501,506,539,544,549],{"type":408,"tag":409,"props":410,"children":411},"element","p",{},[412],{"type":413,"value":414},"text","Any4Kの4K YouTubeダウンローダーは、公開YouTube動画を利用可能な最高解像度で保存します。投稿者が動画を2160pまたは4320pでアップロードしていれば、その画質をそのまま選んでブラウザから直接ファイルをダウンロードできます。インストール不要、登録不要、当社側でのウォーターマーク追加もありません。",{"type":408,"tag":416,"props":417,"children":419},"h2",{"id":418},"_4kダウンロードが本当に有効な場面",[420],{"type":413,"value":421},"4Kダウンロードが本当に有効な場面",{"type":408,"tag":409,"props":423,"children":424},{},[425],{"type":413,"value":426},"4Kが適切な選択になるのは、元の動画がシャープで、再生デバイスが大きく、ストレージに余裕がある場合です。スマートフォンで撮影したVlogを4Kでダウンロードしても、ソース自体が制約を受けているため、1080pと比べて目に見える差はほとんどありません。一方、実機カメラで撮影された映像作品、ミュージックビデオ、テックレビューを4Kでダウンロードすれば、4Kテレビやディスプレイで違いがはっきりと現れます。",{"type":408,"tag":409,"props":428,"children":429},{},[430],{"type":413,"value":431},"簡単なテスト方法：YouTube動画を開き、歯車アイコンをタップして画質メニューを確認します。2160pが表示されていれば、ソースは4Kに対応しており、Any4Kで保存できます。最高オプションが1080p HDなら「4K」でダウンロードしても意味はありません。元のピクセル自体が存在しないからです。",{"type":408,"tag":416,"props":433,"children":435},{"id":434},"_4kパイプラインの仕組み",[436],{"type":413,"value":437},"4Kパイプラインの仕組み",{"type":408,"tag":409,"props":439,"children":440},{},[441],{"type":413,"value":442},"YouTubeは4Kを、VP9やAV1（映像）とOpusやAAC（音声）といった形式で、別々の映像ストリームと音声ストリームとして配信します。ブラウザベースのダウンローダーは両方を取得し、再生可能なMP4またはMKVに結合する必要があります。Any4Kはこのmuxing（多重化）を処理し、どのプレーヤーでもすぐに再生できる1つのファイルを提供します。",{"type":408,"tag":409,"props":444,"children":445},{},[446],{"type":413,"value":447},"他のツールで「video-only」の2160pだけが表示されることがありますが、それは結合されていないストリームです。Any4Kはデフォルトで結合済みの結果を提示します。",{"type":408,"tag":416,"props":449,"children":451},{"id":450},"_4k対1440p対1080p-適切な画質の選び方",[452],{"type":413,"value":453},"4K対1440p対1080p — 適切な画質の選び方",{"type":408,"tag":455,"props":456,"children":457},"ul",{},[458,470,480],{"type":408,"tag":459,"props":460,"children":461},"li",{},[462,468],{"type":408,"tag":463,"props":464,"children":465},"strong",{},[466],{"type":413,"value":467},"2160p（4K UHD）",{"type":413,"value":469}," — 4Kテレビや外部モニターに最適です。10分の動画でファイルサイズは1〜5 GBになることがあります。アーカイブ品質が重要な場合はこれを選びます。",{"type":408,"tag":459,"props":471,"children":472},{},[473,478],{"type":408,"tag":463,"props":474,"children":475},{},[476],{"type":413,"value":477},"1440p（2K QHD）",{"type":413,"value":479}," — ノートパソコンや高DPIのスマホ画面に最適なバランスです。視聴距離ではほとんど画質差を感じないまま、4Kの約半分のサイズに収まります。",{"type":408,"tag":459,"props":481,"children":482},{},[483,488],{"type":408,"tag":463,"props":484,"children":485},{},[486],{"type":413,"value":487},"1080p（フルHD）",{"type":413,"value":489}," — 万能で、あらゆるデバイスで再生でき、AirDropやクラウドストレージへのアップロードも容易な小ささです。",{"type":408,"tag":409,"props":491,"children":492},{},[493],{"type":413,"value":494},"低い画質へはいつでも下げられますが、1080pのコピーから4Kへ戻すことはできません。",{"type":408,"tag":416,"props":496,"children":498},{"id":497},"コーデックの選択mp4webmmkv",[499],{"type":413,"value":500},"コーデックの選択：MP4、WebM、MKV",{"type":408,"tag":409,"props":502,"children":503},{},[504],{"type":413,"value":505},"4Kダウンロードではコーデックが互換性を左右するため、コンテナの選択が重要です：",{"type":408,"tag":455,"props":507,"children":508},{},[509,519,529],{"type":408,"tag":459,"props":510,"children":511},{},[512,517],{"type":408,"tag":463,"props":513,"children":514},{},[515],{"type":413,"value":516},"MP4（H.264 / AVC）",{"type":413,"value":518}," — 最も互換性が高い形式です。4Kでは効率の面で最高ではないかもしれませんが、あらゆるデバイスと編集ソフトで再生できます。",{"type":408,"tag":459,"props":520,"children":521},{},[522,527],{"type":408,"tag":463,"props":523,"children":524},{},[525],{"type":413,"value":526},"WebM（VP9）",{"type":413,"value":528}," — Googleが標準で採用する高効率フォーマットです。同じ画質ならファイルサイズが小さくなります。Chrome、Firefox、最近のAndroidで再生できます。古いiOSや多くの編集ソフトではネイティブ対応していません。",{"type":408,"tag":459,"props":530,"children":531},{},[532,537],{"type":408,"tag":463,"props":533,"children":534},{},[535],{"type":413,"value":536},"MKV（AV1）",{"type":413,"value":538}," — 最新で最も効率の高いコーデックです。同じ画質でVP9より約30%小さくなります。VLCや最近のOS以外ではプレーヤー対応が限定的です。",{"type":408,"tag":409,"props":540,"children":541},{},[542],{"type":413,"value":543},"動画を編集する予定がある場合は、安全のためMP4 H.264を選んでください。視聴だけで、ディスク容量を重視するならWebMまたはAV1で問題ありません。",{"type":408,"tag":416,"props":545,"children":547},{"id":546},"責任ある利用",[548],{"type":413,"value":546},{"type":408,"tag":409,"props":550,"children":551},{},[552],{"type":413,"value":553},"4Kダウンロードは、自分が保持する権利を持つコンテンツに限ってください。自分自身のアップロード、パブリックドメインの素材、クリエイティブ・コモンズでライセンスされた作品、または投稿者がダウンロードを明示的に許可している動画などです。YouTubeの利用規約、著作権法、投稿者の権利を尊重しましょう。",{"title":349,"searchDepth":555,"depth":555,"links":556},2,[557,558,559,560,561],{"id":418,"depth":555,"text":421},{"id":434,"depth":555,"text":437},{"id":450,"depth":555,"text":453},{"id":497,"depth":555,"text":500},{"id":546,"depth":555,"text":546},"markdown","content:ja:4k-youtube-downloader.md","content","ja/4k-youtube-downloader.md","ja/4k-youtube-downloader","md",[5,9,40,73,104,143,176,209,241,277,315],null,1793415033070]