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Extract audio

Free online tool to extract audio from MP4, MOV, WebM, MKV, AVI, MPEG, and other video files as MP3

Upload video

Output audio

Choose a file and start processing. The output audio will appear here.

About this tool

Audio extraction reads a sound track from a media container and outputs a separate audio file for editing or transcription of interviews, lessons, and owned videos. A video can contain multiple languages, commentaries, or surround tracks, while a browser workflow commonly processes the default decodable track.

Extraction may re-encode instead of copying the original bitstream losslessly. Confirm that you have rights to process the video and audio, and check duration, start and end points, and sound quality after output.

How to use it

  1. Upload the video

    Choose a browser-supported source and confirm that it contains playable sound.

  2. Set audio output

    Choose the format and required bitrate, then start extraction.

  3. Listen for completeness

    Check the beginning, end, and random middle points for duration, language, and channel correctness.

Supported range and limits

Input containers
MP4, MOV, WebM, MKV, AVI; containers the browser can demux
Output
MP3. When a video carries several audio tracks, the default (first) track is used
Re-encoded
Yes. The track is decoded and re-encoded to MP3, so one lossy generation is added
Video track
Discarded entirely; the original video file is untouched
Main failure mode
The whole video is read into memory, so long or high-bitrate sources can run out of it
Where it runs
FFmpeg compiled to WebAssembly in your browser; the video is never uploaded

When you would use it

  • Preparing interview transcription

    Export only audio from a meeting or interview video to reduce downstream processing data.

  • Reusing owned narration

    Recover narration from a video you produced for a new edit or archive.

  • Turning a recorded lecture or interview into audio

    When only the sound matters, extracting first and handing the result to Audio to Text is far quicker than processing the whole video.

What to know before you start

  • Copyrighted films, courses, and music videos require the appropriate extraction and reuse permission.
  • A multi-track container may yield only its default track; verify track selection in professional software for critical media.
  • Re-encoded quality is limited by the source track, and a higher bitrate cannot add real detail.

Related concepts

container
A media structure organizing video, audio, subtitle, and metadata tracks together.
audio track
An independent sound stream inside a container, possibly representing a language, commentary, or mix.

Frequently asked questions

Does extracting audio upload my video?
No. MP4, MOV, WebM and MKV files are parsed locally in your browser to pull out the audio track, with nothing uploaded.
What format is the extracted audio?
The track is exported as MP3, ready to download for editing, transcription or listening.
Is there a limit on video length?
There is no fixed limit; it depends on your device memory, so longer videos take more time and RAM to process.
Does extracting change the video?
No. The original file is untouched; the tool reads its audio track and writes a separate MP3.
What if the video has several audio tracks?
The default first track is used. If you need a second-language dub or a commentary track, in-browser processing cannot pick between them and you will want a desktop tool.
Why do large videos fail?
The whole file must be read into browser memory to demux it. Files of a few hundred megabytes and up fail on most devices; trim the segment you need first.

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