MP4 to MP3 Converter

Extract the audio from any video and convert it to MP3, entirely in your browser. No upload, 100% private.

Drag & drop a video file, or click to browse

Supports MP4, WebM, MOV, and more

Selectable Quality

Pick Low, Medium, or High bitrate to balance file size against audio fidelity.

Any Video Format

Works with MP4, WebM, MOV, and most other video formats supported by your browser.

100% Private

Conversion runs locally in your browser using FFmpeg.wasm. Your video is never uploaded to any server.

What is MP4 to MP3 Conversion?

MP4 is a container format that can hold both a video track and an audio track together in one file. MP3 is an audio-only format. "Converting" MP4 to MP3 doesn't turn video into sound — it discards the video track entirely and re-encodes the existing audio track into the MP3 codec, producing a much smaller file that contains only what you could already hear.

This is useful any time the audio is what actually matters: pulling a song out of a music video, getting the audio from a recorded lecture or meeting so you can listen without the video file's size, or extracting a voice memo that was accidentally recorded as a video clip.

How to Convert MP4 to MP3

  1. 1

    Upload your video file

    Drag and drop a video file onto the upload area, or click to browse and select one from your device. The file loads directly in your browser — nothing is sent anywhere yet.

  2. 2

    Choose your audio quality

    Pick Low (128 kbps), Medium (192 kbps), or High (320 kbps) depending on whether you care more about a small file or the best possible audio fidelity.

  3. 3

    Convert to MP3

    Click "Convert to MP3." Conversion runs entirely in your browser using FFmpeg.wasm, so larger files take a bit longer depending on your device.

  4. 4

    Preview the result

    Once conversion finishes, an audio player appears so you can listen to the converted MP3 before downloading it.

  5. 5

    Download your MP3

    Click "Download MP3" to save the file to your device, named after your original video file with a .mp3 extension.

Choosing the Right Bitrate

MP3 bitrate controls the tradeoff between file size and audio quality. Higher bitrates sound better but produce larger files:

  • 128 kbps (Low): Smallest file size. Fine for spoken-word content like podcasts, lectures, and meeting recordings where music-grade fidelity doesn't matter.
  • 192 kbps (Medium): The most common general-purpose choice — a good balance of quality and size for most music and mixed content. This is the default.
  • 320 kbps (High): The highest standard MP3 bitrate, close to CD-quality for most listeners. Best when you care about audio fidelity, at the cost of a larger file.

Frequently Asked Questions

Is my video uploaded to a server during conversion?
No. Conversion happens entirely in your browser using FFmpeg.wasm — your video file is never transmitted anywhere.
What's the difference between the quality options?
They set the MP3 bitrate (128/192/320 kbps). Higher bitrates sound better but produce larger files; see the bitrate guide above for which to pick.
Can I convert formats other than MP4?
Yes. This tool accepts any video format your browser can play, including WebM, MOV, and MKV, not just MP4.
Will I lose audio quality during conversion?
MP3 is a lossy format, so there's some quality loss compared to the original audio, but at 192 kbps or higher this is generally not noticeable for typical listening.
Why does conversion take a while for large files?
FFmpeg.wasm runs entirely on your device's CPU with no server to offload to, so larger or longer videos take proportionally longer to process.
What happens to the video portion of my file?
It's discarded. Only the audio track is kept and encoded to MP3 — the original video file on your device is untouched.
Can I convert a video that has no audio track?
No — if the video has no audio track, conversion will fail with an error, since there's no audio to extract.

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📖 Read the full MP4 to MP3 Converter guide