How to Extract Audio (MP3 / AAC) from Any Video File

To extract audio from a video, use Zro7 Extract Audio from Video. It pulls the audio track from MP4, MOV, MKV, or WebM and gives you MP3, AAC, WAV, or FLAC — losslessly by stream-copy when the source codec matches your target. All in your browser via ffmpeg.wasm.

Lossless vs re-encode

• Stream-copy (lossless) — if the video's audio is already AAC (most MP4/MOV) and you want AAC out, we copy the packets. Instant, zero quality loss.
• Re-encode — needed when converting to MP3, WAV, or FLAC, or when the source uses a different codec. Uses LAME (MP3), PCM (WAV), or FLAC as appropriate.

Which format to pick

• MP3 — universal compatibility; pick 192 kbps for spoken word, 256 kbps for music.
• AAC — better quality than MP3 at same bitrate; native to MP4 videos, so lossless copy is possible.
• WAV — uncompressed PCM; use for editing / mastering / transcription workflows.
• FLAC — lossless compression; half the size of WAV, no quality loss, great for archival.

Steps

1. Open Extract Audio from Video.
2. Drop the video.
3. Pick output format and (if re-encoding) bitrate.
4. Click Extract.
5. Download the audio file.

Common workflows

• Interview recorded as MP4 → extract AAC losslessly → send to Normalize Audio before transcription.
• Lecture video → extract MP3 at 96 kbps mono for tiny podcast-style file.
• Music video → extract WAV for editing in Audacity / Ableton.