Convert MP4 to MP3 Online
Extract high-bitrate MP3 audio from MP4 videos in seconds. Zero upload time, 100% privacy, and studio-grade 320 kbps quality.
Initializing MP4 converter engine…
Your Privacy is Protected
- Your files are processed entirely in your browser
- No file upload — your video never leaves your device
- No account or registration required
- Files are not stored on any server
How to Convert MP4 to MP3 in 4 Steps
- 1
Drop Your MP4 Video
Select or drag your .mp4 or .m4v file onto the upload box. The video stays 100% on your device.
- 2
Select MP3 Quality (up to 320k)
Pick 192 kbps for standard music, 128 kbps for speech/podcasts, or 320 kbps for uncompressed studio fidelity.
- 3
Demux & Convert Locally
Click Convert. Our browser engine separates the audio stream from the MP4 container and encodes clean MP3 audio in seconds.
- 4
Preview Audio & Download
Play the audio directly in our built-in web player to verify sound quality, then download your MP3 instantly.
How MP4 to MP3 Conversion Works Inside Your Browser
MP4 (MPEG-4 Part 14) is a digital multimedia container format. An MP4 file doesn't just hold video; it bundles separate streams: an H.264, H.265, or AV1 video track, an AAC or MP3 audio track, and optional subtitle tracks.
When you use MediaConvertKit's MP4 to MP3 converter, our WebAssembly engine performs a process called demuxing. It isolates the audio track from the video stream, strips away the heavy video frames entirely, and re-encodes the audio into a clean, universal MP3 audio file using the high-performance LAME audio encoder.
Common Use Cases for Extracting MP3 from MP4
Music & Concert Videos
Extract songs from live performances and music videos to play in Spotify, Apple Music, or car audio.
Podcasts & YouTube Videos
Convert video podcasts, webinars, and interviews to listen offline while driving, walking, or at the gym.
Lectures & Study Audio
Turn recorded university lectures, Zoom meetings, and audiobooks into compact study audio files.
Free Up Gigabytes of Space
Archive only the audio when the video visuals are no longer needed to save immense hard drive space.
Universal Device Playback
MP3 plays natively on literally every device, including smart TVs, vintage MP3 players, and smart speakers.
Audio Editing & Sampling
Extract audio before opening in editing tools like Audacity, GarageBand, Premiere, or Logic Pro.
MP4 Input & MP3 Output Specs
Input Formats
Output Format
Frequently Asked Questions: MP4 to MP3
- Simply upload your MP4 file above, select your desired MP3 quality (128 kbps, 192 kbps, 256 kbps, or 320 kbps), and click "Convert to MP3". Our tool runs WebAssembly FFmpeg directly inside your web browser, giving you an immediate MP3 download without installing any software or apps.
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Have a different video format? (MOV, MKV, WebM, AVI)
Use our universal Video to MP3 converter supporting all 10+ major video formats.