Free Audio Extractor: Video to MP3, WAV or M4A Online

Choose a video file to begin.

Nothing is uploaded. The converter (about 32 MB) downloads only after you choose a file.

The Starter plan is $0 per month. Paid plans are billed monthly or annually; see the pricing page for details.

What this audio extractor is

A video file is a container (such as MP4, MOV, MKV or WebM) that holds a video track, one or more audio tracks and metadata. This free audio extractor pulls the first audio track out of the container and saves it as an MP3, WAV or M4A file you can download. It uses ffmpeg.wasm, which is FFmpeg compiled to WebAssembly, so the work happens inside your browser. Runs entirely in your browser. Nothing is uploaded or sent to us. The file is read from your device, converted locally and offered back as a download.

How to extract audio from a video

Choose a video file. The converter begins downloading (about 32 MB, then cached by your browser).
Pick MP3, M4A or WAV. Open Quality options to set the bitrate for MP3 and M4A.
Press Extract audio and watch the progress bar. Keep the tab open until it finishes.
Play the preview, then press Download.

MP3, M4A or WAV?

MP3 is a compressed (lossy) format that plays almost everywhere. At 192 kbps it uses about 1.4 MB per minute.
M4A (AAC) is another compressed format, stored in an MP4-style container. It is widely supported on phones and Apple devices.
WAV stores uncompressed 16-bit PCM audio. It is the largest option, roughly 10 to 12 MB per minute for stereo at 44.1 or 48 kHz, and suits editing and archiving.

Extracting converts (re-encodes) the audio, so MP3 and M4A are lossy copies of the original track. Choose WAV if you plan to edit the audio further.

File size limit and speed

Because everything runs in your browser's memory, this tool accepts files up to 1 GB. A larger file shows a message instead of starting. Conversion speed depends on your device and the file length; the progress bar shows how far along it is. If the browser runs out of memory, try a shorter clip, choose MP3 or M4A instead of WAV, or close other tabs. For very large files, desktop software such as FFmpeg itself is a better fit.

Why streamers extract audio

Common reasons include turning a recorded stream or webinar into a podcast episode, pulling a voice track to clean up in an audio editor, or checking the audio of a recording on its own. If you record your broadcasts, Multistream Platform includes cloud recording (see features), and the finished video can be run through this tool. To check your microphone before the next stream, use the microphone test, and see how to multistream with OBS Studio for the encoder side.

Only extract audio from video you made or have permission to use. Copyright and platform terms still apply to the audio you save.

Common errors and what they mean

This file has no audio track. The video was exported without sound, so there is nothing to extract.
The file could not be read. It may be damaged, incomplete or in a format the converter does not support. Re-exporting as MP4 usually helps.
The browser ran out of memory. Use a shorter file or a compressed format instead of WAV.
The converter could not be downloaded. Check your connection. Some networks or browser settings block WebAssembly or large downloads.
That file is too large. The limit is 1 GB.

Privacy

Your video is opened with the browser's file picker and read only by code running in this tab. It is not uploaded to our servers and no copy is kept. The download is created in your browser. The tool still needs to download the converter files from this website, and those files contain no information about your video.

Open-source licences

This tool includes open-source software that is served from this website, unmodified:

ffmpeg-core (FFmpeg n5.1.4 compiled to WebAssembly), from the npm package @ffmpeg/core 0.12.10. It is licensed under the GNU General Public License, version 2 or, at your option, any later version, because the build includes GPL-licensed components (for example x264 and x265). The MP3 encoder is LAME (libmp3lame). Read the GPL v2 text and the notice with versions, build configuration and source links. You can also request the corresponding source at hello@multistreamingplatform.com.
@ffmpeg/ffmpeg (JavaScript wrapper), version 0.12.15, MIT licence, Copyright (c) 2019 Jerome Wu: licence text.

FFmpeg is a trademark of Fabrice Bellard, originator of the FFmpeg project. This site is not affiliated with or endorsed by the FFmpeg project.

Sources

Audio extractor FAQ

Is my video uploaded when I extract audio?

No. The file is read and converted inside your browser tab and never sent to our servers. Only the converter files are downloaded from this website.

Which video formats can I use?

MP4, MOV, MKV and WebM files are the main targets, up to 1 GB, and the underlying FFmpeg engine reads many other containers too. The first audio track in the file is extracted.

Which audio formats can I save?

MP3, M4A (AAC) and WAV (uncompressed 16-bit PCM).

Why does the first run take longer?

The converter is about 32 MB and downloads after you choose a file. Your browser caches it, so later visits start faster.

Why is there a 1 GB file limit?

The conversion runs in your browser's memory, which is more limited than a desktop program. A message appears if a file is larger than the limit.

Which licence does the converter use?

The ffmpeg-core build used here is licensed under the GNU GPL version 2 or later because it includes GPL components. The JavaScript wrapper is MIT licensed. The notices and source links are on this page and in the vendor folder.

Can I extract audio from any video?

Only extract audio from video you made or have permission to use. Copyright and the terms of the platform you downloaded from still apply.

Why does extraction fail with no audio track?

The video was exported without sound, or its audio is in a track the converter cannot read. Try re-exporting the video as MP4 with audio.

Have questions that aren't listed here? Talk to the team