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MP4 to MP3 Converter Online

Extract audio from MP4 videos and save as MP3

100% client-side — your data never leaves your browser

How to Use MP4 to MP3

  1. 1

    Drop your video file

    Drag and drop an MP4 (or any supported video) onto the upload area, or click to browse.

  2. 2

    Choose a bitrate

    Select 128, 192, or 320 kbps depending on the quality you need.

  3. 3

    Convert

    Click 'Convert to MP3' and wait for the progress bar to complete.

  4. 4

    Download

    Preview the extracted audio, then click Download MP3 to save it.

Frequently Asked Questions

Is my data safe?
Yes. All processing happens entirely in your browser. Your data never leaves your device and is never uploaded to any server.
What video formats are supported?
Any format your browser can decode — typically MP4 (H.264/AAC), WebM (VP8/VP9/Opus), MOV, and AVI. Formats that require proprietary codecs (e.g. some MKV files) may not decode correctly in all browsers.
Why does the conversion take a while for long videos?
Decoding the video and re-encoding the audio as MP3 happens entirely on your CPU in JavaScript. Modern laptops handle this quickly, but very long files (1+ hour) can take a couple of minutes. A progress bar shows the current position.
Can I extract audio from a video without an audio track?
No. If the video file has no audio stream, the tool will show an error. Screen recordings or silent videos cannot produce an audio output.

Learn more

What Is MP4 to MP3

Extract the audio track from any MP4, MOV, AVI, or WebM video file and save it as a high-quality MP3 — entirely in your browser. No upload, no waiting, no watermark. Choose from 128, 192, or 320 kbps bitrates to balance file size and audio fidelity. Ideal for ripping audio from recorded lectures, interviews, podcasts saved as video, music videos, and more. Processing uses the Web Audio API for decoding and the lamejs encoder for MP3 output, so your video file never leaves your device.

Why Use MP4 to MP3

  • 100% private — your video file is never uploaded to any server. All decoding and encoding happens locally in your browser.
  • No file size limits or account required. Convert as many videos as you need.
  • Choose the MP3 bitrate that fits your use case: 128 kbps for podcasts and voice, 192 kbps for general music, 320 kbps for archival quality.
  • Works with virtually every video format your browser can decode: MP4, MOV, AVI, WebM, and more.
  • Instant results for short clips — longer videos show a real-time encoding progress bar so you always know where you are.

MP4 to MP3 Use Cases

Lecture and meeting recordings

Strip the audio from recorded Zoom or Teams calls to create a smaller file you can listen to on the go.

Music videos

Extract the audio track from a music video download to get an MP3 you can add to your playlist.

Podcast production

Convert a video interview recorded on your phone or camera into an MP3 ready to edit in your DAW.

Language learning

Pull audio from video lessons and load it onto your phone to practice listening offline.

Tips & Best Practices

  • 💡128 kbps is sufficient for spoken-word content like podcasts and lectures. Use 320 kbps when audio fidelity matters, such as for music.
  • 💡The output quality is capped by the source. If the video's audio was recorded at low quality, a higher bitrate setting will not improve it.
  • 💡For very long videos (over 1 hour), the encoding step can take a minute or two — the progress bar keeps you informed.

How It Compares

Unlike online converters such as CloudConvert or Online-Convert, TinyTool's MP4 to MP3 tool never uploads your video to a server. This means there are no file size caps, no queues, and complete privacy. The trade-off is that encoding speed depends on your device — a modern laptop will encode a 60-minute video in under 2 minutes.

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