MP4をMP3に変換 — 無料オンライン音声抽出
どんなMP4動画からも高品質MP3として音声を取り出し。ポッドキャスト、音楽抽出、音声アーカイブに最適。
MP4をMP3に変換 — 無料オンライン音声抽出 を3ステップで使う
- 1
Upload the MP4
Drag or browse for an MP4 video up to 2 GB. Any codec (H.264, H.265, AV1) supported.
- 2
Pick MP3 quality
Choose a bitrate — 96 kbps for voice, 192 kbps balanced, or 320 kbps maximum quality.
- 3
Download the MP3
FFmpeg.wasm extracts locally. Download the MP3 instantly.
MP4をMP3に変換 — 無料オンライン音声抽出 を選ぶ理由
Universal MP3 output
MP3 plays everywhere — iPhones, Android, cars, smart speakers, legacy MP3 players.
Quality presets
96, 128, 192, 256, 320 kbps. Balance size against fidelity for your use case.
Fast conversion
When MP4 already holds MP3 audio, we stream-copy (instant). Otherwise re-encode at chosen bitrate.
No upload
All conversion runs in your browser via FFmpeg.wasm.
Free, unlimited
No account, no watermark, no file-count limit.
MP4をMP3に変換 — 無料オンライン音声抽出 の利用者
Podcast production
Extract the audio of a video podcast recording as MP3 for standalone episode publishing.
Music from music videos
Save the audio of a music video MP4 for personal listening on a portable MP3 player.
Lecture audio
Extract MP3 from a recorded lecture for commute listening or transcription submission.
世界中のクリエイターのために
世界中のクリエイター、ジャーナリスト、学生、研究者のために。
よくある質問
- What MP4 audio codecs are supported?
- AAC, MP3, AC-3, E-AC-3, Opus — essentially every audio codec found in MP4 files.
- What bitrate should I pick?
- For spoken-word content, 96-128 kbps is fine. For music, 192 kbps is balanced; 320 kbps is near-CD quality.
- Will quality be lost?
- If the source MP4 already has MP3 audio and you pick a matching bitrate, we stream-copy — no loss. Otherwise a single re-encoding step at your chosen bitrate.
- What is the size limit?
- Up to 2 GB per MP4 reliably. For very large files, split first.
- Are my files uploaded?
- No — all processing runs in your browser.
- Can I get an M4A or WAV instead?
- Yes — use our Video to Audio tool for format flexibility (M4A, WAV, AAC, OGG options).