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How-To Guide

How to Extract Audio from a Video File

Extracting audio from a video gives you just the soundtrack — the music from a movie clip, the audio from an interview, the narration from a tutorial. If the video uses AAC or MP3 audio (as most MP4 files do), you can extract the audio stream losslessly in seconds. This guide covers browser tools, VLC, and FFmpeg.

Open MP4 to MP3 Converter

Step-by-step instructions

  1. 1

    Check the audio codec in your video

    The extraction method depends on the audio codec in your video. For MP4 files: the audio is almost always AAC. For MKV: could be AAC, MP3, AC3, DTS, or FLAC. For MOV (iPhone): AAC. You can check in VLC: Media → Codec Information → look at the Audio section. Knowing the codec helps you choose lossless extraction vs. re-encoding.

    Go to converter
  2. 2

    Method 1: Browser converter (simplest)

    Go to formatdrop.com → Audio Converter (or Video Converter). Drop your video file. Select MP3 or AAC as output. The tool extracts and converts the audio track. Best for casual extraction where you need an MP3 output regardless of source codec.

  3. 3

    Method 2: VLC

    VLC → Media → Convert/Save → Add your video file → click Convert/Save. In the Profile dropdown, select 'Audio - MP3' or 'Audio - AAC'. Importantly: in the profile settings, deselect the Video checkbox so only audio is processed. Set output filename with .mp3 or .aac extension. Click Start.

  4. 4

    Method 3: FFmpeg lossless extraction (best quality)

    For an MP4 with AAC audio, extract AAC losslessly: ffmpeg -i input.mp4 -vn -c:a copy output.aac. The '-vn' drops the video; '-c:a copy' copies the audio stream without re-encoding. The output .aac file is bit-for-bit identical to the audio in the MP4. To extract as MP3 (re-encoding required): ffmpeg -i input.mp4 -vn -c:a libmp3lame -q:a 2 output.mp3

  5. 5

    Method 4: Audacity (for editing and export)

    Audacity (audacityteam.org, free) can import video files and extract audio. File → Import → Audio → select your video. Audacity displays the audio waveform. You can trim, clean, or edit it. Then File → Export → Export as MP3 (or WAV, FLAC, OGG). Audacity requires the FFmpeg library for video import — install it from the Audacity preferences.

Why convert MP4 to MP3?

Audio extraction is one of the most common media conversion tasks: pulling a song from a music video, getting the audio track from a lecture recording for podcast listening, extracting interview audio for transcription, or archiving the audio commentary from an old DVD. If the video's audio codec matches your desired output (e.g., extracting AAC from an MP4 to an AAC file), the operation is instant and lossless. If you need MP3 output from an AAC source, re-encoding is required but modern encoders produce excellent MP3 quality.

Your files never leave your device

FormatDrop runs the conversion engine entirely inside your browser using WebAssembly. No file upload. No server. Nothing stored. You can verify this by opening DevTools → Network tab and watching: zero upload requests.

Frequently asked questions

Is it possible to extract audio from video without quality loss?
Yes — if you extract to the same codec that's in the video. MP4 with AAC audio → extract as AAC: completely lossless (just demuxes the stream). MKV with FLAC audio → extract as FLAC: lossless. But if you convert AAC to MP3, there's generation loss. For lossless extraction in any format: use ffmpeg -vn -c:a copy. For an MP3 output specifically, re-encoding is always required (AAC and MP3 are different codecs).
How do I extract multiple audio tracks from an MKV?
MKV files can contain multiple audio tracks (e.g., English, Spanish, French). To list tracks: ffprobe input.mkv. Each track has a stream index (0:0 = video, 0:1 = first audio, 0:2 = second audio). Extract a specific track: ffmpeg -i input.mkv -map 0:2 -c:a copy second_audio.aac. Replace 0:2 with the index of the track you want. MKVToolNix (free GUI) also handles multi-track MKV extraction with a visual interface.
Can I extract audio from YouTube videos?
You can extract audio from video files you own or have rights to. For YouTube specifically, downloading YouTube videos may violate YouTube's Terms of Service. Many people extract audio from videos they've recorded themselves, purchased, or have explicit rights to process. For YouTube content you want audio from, check if the creator has released an audio version on Spotify, Apple Music, or their own website first.
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