MultiKit

Video to MP3: Extract the Sound of a Video, No Upload

  • Free
  • No sign-up
  • Runs in your browser
  • Version 1.0.2
  • Last updated 2026-11-02
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Save the sound of a video as an MP3: a song, a lecture, an interview. The video stays on your device and only the sound is written.

What this browser can make

    This depends on your browser, not on MultiKit. Chrome and Edge support the most.

    Everything you enter is processed in your browser and is never sent to a server.

    Browsers:Chrome94+Edge94+Firefox130+Safari26+Opera80+Samsung Internet17.0+BrowsersWhich formats it can read and write also depends on your browser and device; the tool shows what yours can do.

    How to use

    1. Drop the video onto the box, or choose it. MP4, MOV, WebM and MKV are accepted.
    2. MP3 is already chosen. Choose the quality: 128 kbps is fine for speech, 192 kbps for music.
    3. To keep only a part, type the start and the end. Press Convert, then Download.

    Examples

    lecture.mp4, 60 minutes, MP3 at 64 kbps mono
    → About 29 MB
    64,000 × 3,600 ÷ 8 is 28.8 MB.
    music-video.mp4, MP3 at 192 kbps
    → About 1.4 MB per minute
    192,000 × 60 ÷ 8.
    clip.webm, part from 0:10 to 0:40
    → A 30-second MP3
    Only the part between the times is kept.
    A silent screen recording
    → The message: This file has no sound.
    A video with no sound track has nothing to take out.
    A video from 5:00 to the end, Start 5:00, End left empty
    → An MP3 of everything after the five-minute mark
    An empty End box means the end of the file.
    Holiday 2024: day 1.MOV
    → Holiday 2024_ day 1.mp3
    Characters that file names cannot hold, such as a colon, become an underscore.

    How it works

    This page is the audio converter with MP3 chosen and video files accepted. The file is read by the open-source Mediabunny toolkit; the picture track is left out, the sound is decoded by the WebCodecs of your browser, and it is encoded by LAME, the standard open-source MP3 encoder (LGPL), built as a separate WebAssembly module (credited at lame.sourceforge.io). This page uses the audio and video codecs built into your browser, so what it can read and write depends on the browser. The list under the tool shows what yours can make. Chrome and Edge support the most.

    What comes out

    The MP3 holds the sound track of the video, decoded and encoded again at the bitrate you choose. It is the whole sound unless you type a start and an end. Its length is the length of the part kept, and its size is the bitrate times that length divided by 8, wherever the video came from.

    Video sound Bitrate Size per hour
    Lecture, talk, interview 64 kbps, mono 28.8 MB
    Podcast or audiobook 128 kbps 57.6 MB
    Music video 192 kbps 86.4 MB

    When there is nothing to take

    A file with no sound track is reported as having no sound. A file whose sound uses a codec the browser cannot decode is reported with the name of that codec, and a file that cannot be read at all, or is damaged, is reported as that. The page tells you what is wrong instead of giving you a file.

    The sound is only as good as the video’s

    A video’s sound is already compressed, usually as AAC or Opus. Turning it into MP3 compresses it a second time, so the MP3 is never better than the video’s own sound. For speech this makes no practical difference. For music you want to keep, find the original audio instead of ripping it from a video.

    Sources

    Frequently asked questions

    Is this legal?
    It depends on the video. Saving the sound of your own recordings, or of material you have the right to, is fine. Copying other people's work may not be, wherever you do it.
    Does it work with video from a phone?
    Yes, if the browser can read its sound. A few phone recordings use sound formats that some browsers cannot read, and the page then says so.
    Is the video uploaded?
    No. The sound is taken out in your browser.
    Why does it ask for a recent browser?
    This page uses the audio and video codecs built into your browser, so what it can read and write depends on the browser. The list under the tool shows what yours can make. Chrome and Edge support the most.
    Can I take the sound as WAV or M4A instead?
    Yes, choose another format in the list, or use the audio converter.
    How big is the MP3 of a long video?
    Only the bitrate and the length matter, not the size of the video. A 2-hour film at 128 kbps is 115.2 MB, while the video file itself may be several gigabytes. At 64 kbps it is half of that.
    Can I take only part of the video's sound?
    Yes. Type a start and an end, as seconds or a time like 1:23.5, before converting. Leave Start empty to begin at the start of the file and End empty to run to the end. A start after the end of the file, or an end before the start, is reported.
    What happens to the picture?
    It is not used. The video track is left out of the result.
    What is the largest video I can use?
    2 GB, because the browser has to hold the file while it works. For a bigger video, cut a shorter part with a video tool first.
    The page says the sound cannot be read. What now?
    The video's sound uses a codec that this browser cannot decode. Try Chrome or Edge, which read the most, or a different copy of the video.

    Guides

    Version history
    • 1.0.2 — Adds what comes out of a video (size by bitrate and length), what happens when there is nothing to take, why the MP3 cannot beat the video’s own sound, and more examples and questions.
    • 1.0.1 — Makes the search title and description state the supported task, key formats and privacy benefit more clearly.
    • 1.0.0 — First release.

    Last updated: