Castos
Free Podcast Tool

Extract Audio From Video

Turn an MP4, MOV, WebM, or MKV video into an MP3 or WAV file. Free, private, and entirely in your browser.

Your video stays on your device. Nothing is uploaded or stored.

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How To Extract Audio From A Video

  1. Step 1

    Choose Your Video

    Select an MP4, MOV, M4V, WebM, or MKV file from your device. Files can be up to 2 GB and never leave your browser.

  2. Step 2

    Pick MP3 Or WAV

    Use MP3 for a smaller file that plays almost anywhere. Choose WAV for uncompressed audio you plan to edit.

  3. Step 3

    Extract And Download

    Click Extract Audio, preview the result, and download it. There is no account, upload, or watermark.

Convert Video To MP3 Without Uploading It

Most online converters send your entire video to a server before they can return an audio file. This tool loads the converter into your browser instead. Your device separates the audio track locally, which keeps unreleased interviews, client recordings, and private videos off someone else's server. Close the tab and the working files disappear.

MP3 For Sharing, WAV For Editing

MP3 compresses audio into a much smaller file, making it the practical choice for listening, sharing, and uploading to a podcast host. A 192 kbps MP3 is a good default for spoken audio. WAV is uncompressed and much larger, but it avoids another lossy conversion when you plan to edit, clean up, or master the audio afterward.

Repurpose A Video As A Podcast Episode

A webinar, interview, livestream, or YouTube video can become an audio episode without another recording session. Extract the audio, make any edits it needs, then upload it to your podcast host. You can reach people who prefer to listen while giving an existing recording a longer useful life.

Audio Ready? Publish Your Podcast In 3 Steps

  1. Upload a new episode in Castos

    Upload The Audio

    Create a show in Castos and upload the MP3 you just extracted, along with a title and episode description.

  2. Fill in podcast details in Castos

    Get Your Feed And Website

    Castos creates the RSS feed podcast apps need and a customizable site where listeners can find every episode.

  3. Link your feed to each podcast directory

    Publish Everywhere

    Submit your feed to Apple Podcasts, Spotify, and other directories once. Future episodes are distributed automatically.

Frequently Asked Questions

How do I extract audio from a video?
Choose your video above, select MP3 or WAV, and click Extract Audio. The converter separates the first audio track in your browser and gives you a file to preview and download. You do not need editing software or an account.
Can I convert video to MP3 for free?
Yes. This video to MP3 converter is free, requires no account, and adds no watermark. You can choose 128, 192, 256, or 320 kbps. For speech and podcasts, 192 kbps gives a useful balance of quality and file size.
Is my video uploaded?
No. Your browser processes the video on your device with WebAssembly. Castos never receives or stores the source video or extracted audio. The first conversion may take a moment because the browser needs to load the converter before it starts.
Which video formats can I convert?
The tool accepts MP4, MOV, M4V, WebM, and MKV files up to 2 GB. These containers can hold many different codecs, so an unusual file may not convert even when its extension is supported. Exporting it as a standard MP4 is the best fallback.
Should I choose MP3 or WAV?
Choose MP3 for a smaller file that works in browsers, podcast hosts, phones, and editing apps. Choose WAV when you want uncompressed audio for editing and have room for a larger download. Converting to WAV does not restore quality that was already lost in the video's audio track.
Can I extract audio from a YouTube video?
This tool converts video files already saved on your device. It does not download videos from YouTube, TikTok, or other websites. Only convert recordings you own or have permission to use.

Related Tools

Turn Your Video Into A Podcast

Upload your extracted audio to Castos and publish it to every podcast app from one place.

Get Started For Free