Convert MP4 to MP3 Free — Extract Audio from Any Video

MP4 to MP3 is the most searched video conversion on the internet, with over 224,000 people searching for it every month. The reason is simple: you have a video but only need the audio. Maybe it is a music video, a recorded lecture, a podcast interview filmed on video, or a voice memo that your phone saved as MP4.

Most online converters require you to upload your file to a remote server. MiOffice takes a different approach. FFmpeg runs directly in your browser via WebAssembly, so your video never leaves your device. The audio is extracted locally and the MP3 is generated right in your browser tab.

How to Convert MP4 to MP3

1. 1

   Open the MP4 to MP3 Converter

   Go to the MP4 to MP3 converter. No signup or account needed.

2. 2

   Select Your MP4 File

   Drag and drop your MP4 video or click to browse. Choose your preferred audio quality (128kbps to 320kbps).

3. 3

   Download Your MP3

   Click convert. FFmpeg extracts the audio track and encodes it as MP3. Download your file when processing completes.

MP4 to MP3: File Size Comparison

MP4 to MP3 vs Other Converters

Common Uses for MP4 to MP3 Conversion

• --Music extraction: Save the audio from music videos for offline listening on any MP3 player or phone.
• --Podcast production: Extract audio from video interviews for your podcast feed.
• --Lecture listening: Convert recorded lectures to MP3 for listening during commutes.
• --Ringtones: Extract audio, then use MP3 Cutter to trim to the exact segment.

Privacy: Why It Matters

When you upload an MP4 to a typical online converter, every frame of your video goes to a third-party server. MiOffice processes everything locally using FFmpeg WebAssembly. Open your browser's Network tab during conversion and you will see zero file uploads. When you close the tab, the data is gone.