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2025年4月25日付のプレスリリースは、iRocket Fildownのバージョン1.0.4公開を伝え、Fildown、UniConverter、Freemake Video Converter、VLC Media Player、Any Video Converter Freeの5製品を紹介しています。ただし、紹介文が扱うのは端末内のMP4ファイルをMP3に変換する用途です。YouTubeから動画や音声を直接ダウンロードできること、各製品が現在も無料であることや最新OSに対応することを確認した比較ではありません。
記事で紹介されている5製品は？
2025年4月25日付の発表資料は、iRocket Fildown 1.0.4のUI更新を告知し、MP4からMP3への変換ソフトとして次の製品を挙げています。これは発表資料に基づく掲載内容であり、現在の提供状況や機能を独立に確認した製品比較ではありません。発表資料（ValuePress）
| 製品 | 発表資料での扱い | ここで確認できる範囲 |
|---|---|---|
| iRocket Fildown | MP4からMP3への変換ソフト。バージョン1.0.4のUI更新を発表 | 発表資料の記載のみ。現行版、対応OS、無料利用の条件は未確認 |
| UniConverter | MP4からMP3への変換ソフト | 発表資料の記載のみ。現行版、対応OS、無料利用の条件は未確認 |
| Freemake Video Converter | MP4からMP3への変換ソフト | 発表資料の記載のみ。現行版、対応OS、無料利用の条件は未確認 |
| VLC Media Player | MP4からMP3への変換ソフト | 発表資料の記載のみ。現行版、対応OS、無料利用の条件は未確認 |
| Any Video Converter Free | MP4からMP3への変換ソフト | 発表資料の記載のみ。現行版、対応OS、無料利用の条件は未確認 |
資料は製品の順位付けや比較テストを示していません。変換速度、安全性、音質、無料版の制限を根拠なく比べることはできないため、表は「おすすめ順」ではありません。
MP4からの変換とYouTubeからのダウンロードは別の操作
端末に保存済みの動画ファイルをMP3に書き出すことと、YouTube上のコンテンツを取得することは同じではありません。変換ソフトがあるからといって、YouTubeからのダウンロードが許可されるわけではありません。
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#1 Best Overall
AGPTEK 64GB MP3 Player with Bluetooth, M3 2.4'' Player with Speaker
- 【64GB BUILT-IN LARGE STORAGE CAPACITY】Different from other large memory MP3 players on the market, the AGPTEK M3 boasts an impressive 64GB of internal storage, can expandable 128GB memory card (total up to 192G). [Other brands have no built-in memory and can only be used with TF card.]【Tip: The file size of a single transfer should not exceed 3GB to ensure the transfer speed and stability.】
- 【Bluetooth 5.3 & Automatic Reconnection】AGPTEK M3 MP3 music player adopts Bluetooth 5.3 technology, more stable connection, better compatibility, and lower consumption. You can pair the Bluetooth MP3 Player with wireless headphones or a Bluetooth speaker, automatically connects to the last Bluetooth device it was connected to, as soon as it is activated.
- 【HiFi Lossless Sound & Sports Partner】 With a professional audio decoding chip and smart noise reduction chip, AGPTEK MP3 player brings you original lossless music. With breakpoint resume function, perfect for doing sports, Yoga, exercise, running, travel, etc. Supports music formats like MP3/APE/FLAC/WMA/WAV/AAC [Note It does not directly support Audible, Apple music and iTunes.]
- 【Multi-function & Long battery life】 M3 MP3 player with Music Play, Video, Recording, Radio, Pictures, e-Books, Pedometer, A-B repeat, etc. Built-in 500mAh battery, it only takes 2.5 hours to fully charge and enjoy long hours of music. Perfect solution to replace mobile phone music, save mobile phone power. (To save power, the player will automatically power off after 5 minute of inactivity. You can turn it off in the settings.)
- 【 2.4'' SCREEN & LINE-IN FUNCTION】Features a 2.4-inch TFT color screen, bringing a clear and beautiful display. Metal middle frame with ABS plastic back shell,the size is approximately 4.4 inches × 2.06 inches × 0.39 inches, Weight: approximately 3.6 oz. And it supports Line-in recording and playback capabilities. Use a LINE IN cable to record from two MP3 players or connect with other devices for recording or play music.
YouTubeの日本向け利用規約ページに掲載された英語の参考訳（2023年6月1日付）は、サービスまたはコンテンツの一部をダウンロードなどの方法で利用することについて、「サービスが明示的に許可する場合」または「YouTubeおよび該当する権利者から事前に書面で許可を得た場合」を例外とし、コピーなどを制限する機能の回避も禁じています。これはYouTubeの規約上の条件であり、あらゆる状況の法律判断を示すものではありません。利用前にYouTube利用規約を確認してください。
権利を持つファイルをMP3に書き出す方法
自分で作成した動画や、権利者から変換・利用の許可を得たファイルなら、音声編集ソフトで必要な部分を選び、MP3として書き出せます。Audacityのマニュアルでは、書き出し時に形式、サンプルレート、MP3ビットレートを選択できます。操作は「File（ファイル）→ Export Audio（音声をエクスポート）」です。全体のほか、選択範囲やループ範囲を書き出す方法も説明されています。Audacityの音声エクスポート手順
Rank #2
64GB MP3 Player with Bluetooth 5.3, Music Player with HiFi Sound for Sports Runners, 2.4" Screen MP3 Player Built in HD Speaker Voice Recorder FM Radio E-Book, Expanded Up to 128GB, Earphone Included
- Large Capacity: This mp3 player is designed specifically for music enthusiasts. It has 64GB storage space, which can easily hold thousands of songs, and supports TF card expansion up to 128GB, so you don't need to change songs frequently or worry about insufficient storage space. (TF card is sold separately)
- The latest version of bluetooth : mp3 player Equipped with the latest version of Bluetooth 5.3 MP3 player, which has better compatibility, signal stability, lower power consumption, longer connection distance, and stronger anti-interference ability. (Note: Bluetooth function only supports Bluetooth headset and Bluetooth speaker connection)
- Easy to operate buttons: This reproductor mp3 has several intuitive buttons. Short press “One-Key Sound” can open the music mode, support breakpoint replay function, continue to play from the last exit position; independent volume key can be up and down toggle the precise adjustment of the volume; Short press “Lock Key” can lock the screen, simple and convenient.
- High quality speakers:MP3 player Equipped with high-quality speakers that deliver clear, undistorted sound. No need to wear headphones, you can enjoy music, listen to books or play recording files directly through the speakers. Whether you're relaxing at home, traveling outdoors or sharing music with friends, the speakers will meet your listening needs.
- Upgraded design: MP3 player Length 4.25 inches (10.85 cm), width 1.95 inches (4.96 cm), thickness 0.37 inches (0.95 cm), weight 80.7 grams, equipped with a 2.4-inch color screen to enhance the visual experience and ease of operation; metal alloy shell both durability and comfortable feel, fashionable appearance to adapt to the sports, commuting, travel and other scenarios, carry no burden.
ビットレートの選び方
保存先から指定がない場合、Audacityの2026年版マニュアルは、音声中心の素材には128 kbps、音楽には256 kbpsを目安として案内しています。これは書き出し設定の推奨であり、元音源の品質を保証する値ではありません。圧縮済みの音源を高いビットレートで保存し直しても、元にない音の情報は戻りません。
書き出し前に確認すること
- 動画全体か一部だけかを決め、必要なら書き出し対象の範囲を選びます。
- 保存先が指定する形式やサンプルレートがあれば、それに合わせます。
- 利用する形式によっては、AudacityでFFmpegのインストールが必要です。選択肢に目的の形式が表示されないときは、マニュアルを確認してください。
動画用の音源を探すならYouTubeオーディオライブラリ
動画制作に使う音楽や効果音が必要な場合は、YouTube Studioのオーディオライブラリが公式の選択肢です。YouTubeのヘルプによると、掲載される音楽・効果音にはMP3でダウンロードできるものがあり、クリエイティブ・コモンズの楽曲は動画説明欄でのクレジット表記が必要です。標準のオーディオライブラリライセンスの楽曲は、同ページによればクレジット表記を必要としません。音源は月2回追加されると案内されています。これは制作向け音源の提供で、YouTube上の任意の動画を書き出す機能ではありません。YouTubeオーディオライブラリのヘルプ
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Rank #3
Sale
64GB MP3 Player with Bluetooth 5.2, AiMoonsa Music Player with Built-in HD Speaker, FM Radio, Voice Recorder, HiFi Sound, E-Book, Earphones Included
- ★【64GB Large Storage & HIFI Lossless Sound】 Each MP3 Player is equipped with a 64GB large-capacity TF card, which allows you to download thousands of your favorite music. And through the powerful DSP audio decoder chip, the most original sound is presented to you. It can ensure the high sound quality of HIFI.（Supports TF cards up to 256GB.）
- ★【Upgraded Bluetooth 5.2 & Support Multiple Formats】 Latest Version Bluetooth 5.2 means that faster transmission speed, longer connection distance and stronger anti-interference ability.Reduced power consumption for more power savings. And support APE / FLAC / WMA / MP3 / ACELP and other lossless formats.
- ★【Built-in HD Speaker & Easy to Carry】 The MP3 player has built-in HD speakers, which can play music without earphones, and no longer need to feel the pain of wearing earphones. MP3 player length is 3.6", width is 1.7" and thickness is 0.35". The body is made of hard and light zinc alloy and weighs only 70 grams. Lightweight and easy to carry.
- ★【Multifunctional MP3 Player for Many Occasions】 Multiple functions in one, music play, FM radio (need to insert a wired headphones), voice recorder, e-book, Alarm clock. Touch buttons with backlight to solve the problem of button noise. Perfect for Sport, Sleeping, Reading, Leaning, Meeting etc.
- ★【Great Gift】Each package contains an MP3 player, wired earphones, a 64GB TF card, a card reader, and a Type-C data cable. It makes an ideal gift for your children, partner, parents, or family on birthdays, Christmas, Thanksgiving, and other special occasions. If you have any questions, feel free to contact us anytime.
商用利用では変換後の使い方も確認する
ファイルをMP3に変換できても、その音源を商用利用できる権利が付与されるわけではありません。YouTubeは収益化に関する案内で、第三者のコンテンツを商用利用するには必要な権利を得ること、明示的な書面による許可が必要となる場合があることを説明しています。公開や収益化の前に、音源ごとのライセンスと権利者の許可条件を確認してください。YouTubeの動画収益化に関するヘルプ
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Best Value
MP3 Player, Hotechs MP3 Music Player with 32GB Memory SD Card Slim Classic Digital LCD 1.82'' Screen MINI USB Port with FM Radio, Voice Record
- 【32GB Large Storage】The portable MP3 player comes with a 32 GB memory SD card and support up to 128GB(not included). Play music with MP3/Voice record/FM Radio/E-book support TXT format/ photo view / video with AMV format.
- 【Easily to Operate 】Designed with Independent Volume Control, Give you a more user-friendly experience.Can also be used as a memory Card reader or for file storage;Built in high speed Mini USB 2.0 cables,Just drag and drop the music file or folder directly when connecting to computer.
- 【HIFI Lossless Sound Quality】It adopts professional intelligent digital noise reduction chip and superb circuit optimization technology to reduce noise, ensuring high sound sampling rate and providing high quality sound.
- 【Long Battery Life&Portable and Lightweight】MP3 player allows you enjoy real lossless music up to 10 hours. And it fully charged within 1-2 hours. Economy and fashion Noise canceling Voice Recorder; Simple files management.Fashionable and exquisite appearance,Perfect for your entertainment and learning,outdoor and gym fitness.
- 【12 Month Warranty】We have a professional after-sales service team. If you encounter any problems, please feel free to contact us directly and you will get a quick response and a satisfactory response. Your satisfaction is our only pursuit.
Rank #4
128GB MP3 Player with Bluetooth 5.3 Earphones Included
- 🎧[128G High Capacity Storage]: This MP3 music player supports up to 128GB Micro TF card (128GB memory card included), which can store up to 4000+ songs and books. Greatly satisfy your need to store songs, videos, audiobooks, let you enjoy music all the time. Support MP3, WMA, WAV, APE, FLAC, AAC-LC, M4A, OGG and other music formats.
- 🎧[Wireless Bluetooth 5.3 and Lossless Sound Quality]: This MP3 player is built-in with the latest Bluetooth 5.3 chip, which provides a more stable and fast connection, better compatibility, and easy connection to remote Bluetooth headphones or Bluetooth speakers. In addition, this MP3 music player has a powerful built-in recording function, HIFI-level sound, clear reproduction of the human voice, so that you feel like immersed in the concert scene.
- 🎧[Multi-functional MP3 Player]: This portable MP3 player is not only a music player, but also a collection of many practical functions, the internal compact body can also play video and pictures, support for one-touch recording, FM radio, reading e-books (TXT format only), alarm clock, calendar, folders, built-in speakers, time screen saver and other functions.
- 🎧 [Compact and Portable, Easy to Use]: This MP3 player is lightweight and portable, you can take it with you anywhere. He is also a companion to accompany your sports, you can take the MP3 running, jogging, cycling, climbing, hiking and so on. 2-3 hours fully charged, up to 45 hours playback time via wired earphones, great for a long trip. Simple operation is easy to use even for the elderly and children!
- 🎧[What You Can Get] You can get an MP3 player, a manual, a 128GB storage card, and a pair of headphones. In addition, this portable MP3 player also comes with a one-year warranty service. If you encounter any problems during use, please contact the seller at any time.
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