Extract audio from any video file instantly in your browser. No uploads, no installs, 100% private.
Drop your video here or click to browse
MP4, MOV, WebM, AVI, MKV supported
MP4 is the world's most popular video container format, used by smartphones, cameras, streaming services, and virtually every video platform. An MP4 file contains both video and audio streams — when you convert MP4 to MP3, the tool extracts the audio stream and re-encodes it as an MP3 file, discarding the video data entirely.
MP3 (MPEG Audio Layer III) has been the standard audio format since the late 1990s. With 99% device compatibility, it plays on every smartphone, computer, car stereo, and smart speaker. At 192 kbps, a 4-minute MP3 file is only about 5.5 MB — roughly 85% smaller than the same audio in WAV format and dramatically smaller than the original MP4 video.
Save storage space: Video files consume significantly more storage than audio files. If you only need the audio from a recording — a lecture, podcast interview, or music video — converting to MP3 frees up substantial disk space. A 1-hour video at 720p might be 1-2 GB, while the same audio as an MP3 at 192 kbps is only about 86 MB.
Create podcast episodes: Many podcasters record video interviews for YouTube and then convert the audio to MP3 for their podcast feed. This dual-publishing workflow reaches both video and audio audiences from a single recording session.
Build audio playlists: Convert music videos, concert recordings, or DJ sets to MP3 to add them to your music library. At 256 or 320 kbps, the audio quality is excellent for casual listening.
Offline listening: MP3 files are small enough to store hundreds of hours of audio on a phone. Convert recorded lectures, audiobook chapters, or training videos to MP3 for offline listening during commutes or workouts.
| Bitrate | Quality | File Size (per min) | Best For |
|---|---|---|---|
| 128 kbps | Good | ~0.9 MB | Podcasts, voice, audiobooks |
| 192 kbps | Great | ~1.4 MB | General music, most uses |
| 256 kbps | High | ~1.9 MB | High-quality music listening |
| 320 kbps | Maximum | ~2.3 MB | Audiophiles, archival |
Most MP4 to MP3 converters online require you to upload your video to their servers. This means your personal videos, private recordings, or copyrighted content passes through unknown infrastructure. Our converter is different — it runs FFmpeg directly in your browser using WebAssembly technology. Your MP4 file is read from your local disk, processed in your browser's memory, and the resulting MP3 is saved back to your device. No data is transmitted over the network, no files are stored on any server, and closing the browser tab clears everything from memory.
The quality of your MP3 cannot exceed the quality of the audio in the original MP4. If the video was recorded with low-quality audio (common in screen recordings or webcam videos), selecting a high bitrate will not improve the sound — it will just make the file larger. For most MP4 files from phones or cameras, 192 kbps is the sweet spot between quality and file size.
Use the trim feature to extract only the portion you need. This is especially useful for long recordings where you only want a specific segment — the conversion will be faster and the resulting file smaller.