Convert MP4 to MP3

Extract audio from MP4 videos and save as MP3 files. Free, private, and browser-based.

How it works

  1. Upload MP4 Files — Drag and drop your MP4 files into the converter, or click to browse. Common sources: smartphones, screen recordings.
  2. Convert to MP3 — The converter extracts the audio track from your MP4 video and encodes it as MP3. Everything happens in your browser — no server upload.
  3. Download Results — Download your converted MP3 files instantly. For multiple files, download individually or as a ZIP archive.

Why convert MP4 to MP3

  • Extract audio from music videos to listen offline without video
  • Save podcast video episodes as audio-only for smaller file sizes
  • Extract soundtracks, voiceovers, or audio content from video recordings
  • Create ringtones or audio clips from video files
  • Reduce storage usage by keeping only the audio portion

FAQ

Is MP4 to MP3 conversion free?
Yes, Fileza.io converts MP4 to MP3 completely free with no limits on file size or number of conversions. No hidden fees, no watermarks, and no account required.

Will I lose quality converting MP4 to MP3?
The audio is extracted directly from the MP4 file. Quality matches the original audio track embedded in the video. You can choose bitrate settings to balance quality and file size.

Is it safe to convert MP4 to MP3 online?
Absolutely. Unlike most online converters, Fileza.io processes your files entirely in your browser using WebAssembly. Your MP4 files are never uploaded to any server — the conversion runs on your own device, keeping your files 100% private.

Can I convert multiple MP4 files to MP3 at once?
Yes, Fileza.io supports batch conversion. Drag and drop multiple MP4 files at once and they will all be converted to MP3 simultaneously. Download them individually or as a ZIP archive.

Does MP4 to MP3 conversion work on mobile?
Yes, the converter works on any device with a modern web browser — iPhones, iPads, Android phones, and tablets. No app installation required.

Will the converted MP3 files be smaller or larger than MP4?
MP3 files are generally smaller than MP4 files. The exact reduction depends on your quality settings and the content of your files.

How long does MP4 to MP3 conversion take?
Most conversions complete in seconds. The exact time depends on file size and your device performance. Since processing happens locally in your browser, faster devices convert more quickly. Video files may take longer due to re-encoding.

What audio quality should I choose for MP4 to MP3?
For music, use 192-320 kbps for the best quality. For speech, podcasts, or voice recordings, 128 kbps provides clear audio at smaller file sizes.