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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 the MP4 to MP3 Converter

Quick answer

To extract audio from a video, drop the file into a converter and pick an audio format such as MP3, WAV, or AAC. Most MP4 and MOV files hold an AAC track, which can be copied out with no quality loss. Choosing MP3 re-encodes the audio, because MP3 is a different codec.

  • Lossless copy — `ffmpeg -i input.mp4 -vn -c:a copy output.aac` pulls the AAC track out of an MP4 unchanged.
  • VLC — Media, then Convert/Save. Add the file, pick 'Audio - MP3', clear the Video checkbox, then press Start.
  • Extract it in your browser — open the audio converter or MP4 to MP3 and drop the video in. Nothing is uploaded.

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: Tools → Codec Information (on a Mac: Window → Media 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)

    Each conversion has its own page: formatdrop.com/mp4-to-mp3 for MP4 files, mov-to-mp3 for iPhone footage, mkv-to-mp3 for MKV — and mp4-to-aac or mp4-to-wav when you want AAC or WAV instead. Drop the video on the page that matches. It pulls the audio track out and converts it locally on your device. There is no output menu — each page does one fixed pair, and a single converter with an output picker is coming soon. MP3 comes out at 192 kbps. The AAC page re-encodes the track rather than copying it, so for an exact lossless copy use FFmpeg (Method 3 below). Free tier takes files up to 10 MB (5 at a time); Pro raises the cap to 500 MB. For videos above the cap, use VLC or FFmpeg.

  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 extract audio from video?

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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Related guides

How to Convert MOV to MP4How to Convert WAV to MP3How to Convert MP4 to GIFHow to Convert MKV to MP4