Extract Audio from Video
Pull audio track.
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How audio lives inside a video file
A video file is a container — MP4, MKV, WebM — holding separate streams that play together: usually one video stream, one or more audio streams, and sometimes subtitles. The container interleaves them and stores the timing that keeps them in sync, but each stream is independently encoded.
That structure is what makes extraction cheap. Because the audio is already a complete encoded stream, pulling it out can be a straight copy — demuxing — with no decoding and no quality loss whatsoever. The audio in an MP4 is typically AAC, so copying it out gives you an AAC or M4A file identical to what was inside. Converting to MP3 instead means re-encoding, which does lose a little quality, so copy the native stream unless you specifically need MP3.
Why we built this tool
People extract audio to keep a lecture or interview as a podcast-style file, to grab music from a video they own, to transcribe a recorded meeting, or to reuse a soundtrack in an edit.
Recorded meetings and interviews are confidential, and video files are large — often hundreds of megabytes, which is precisely what makes uploading them to a converter slow and where free services impose their size caps. Ours runs FFmpeg compiled to WebAssembly inside your browser, so the file is processed on your own machine: no upload wait, no size limit, no account, and no copy of your recording on anyone's server.
Tips and common mistakes
- Copy the native audio stream when you can — it is instant and completely lossless.
- Converting to MP3 re-encodes and costs a little quality, so only do it when something demands MP3.
- Files with several audio streams may need you to pick the language track you want.
- Trim the video first if you only need audio from part of it.
Quick start: using Extract Audio from Video
- Load the video file you want the audio from.
- Choose to copy the native audio stream for lossless extraction, or pick a format to convert to.
- Start the extraction — copying is near-instant, converting takes longer.
- Listen to the result to confirm you got the right stream.
- Download the audio file.
Trim it with Cut Audio, convert it using Convert Audio Formats, or remove the audio from the video with Mute Video.