MP4 to MP3 Converter
Convert MP4 to MP3 free in your browser. Files never leave your device.
Drop files anywhere on this pageTap to choose a file
Mix any types. We detect each one and pick its best format.Photos, Files or iCloud • up to 100 MB
Up to 100 MB per file • Multiple files at once • Ctrl+V works too
How to convert MP4 to MP3
Add your MP4 (.mp4) file
Drag and drop your .mp4 file into the converter box above or click Choose files. You can also paste screenshots or clipboard data with Ctrl+V.
Convert to MP3 (.mp3)
Our in-browser engine processes your .mp4 file directly in memory. No files are uploaded to any server, guaranteeing 100% private conversion.
Download your fresh .mp3
Click Download to save your newly converted .mp3 file to your device. There are zero watermarks, zero size traps, and no waiting room.
What are MP4 and MP3 files?
What is a MP4 file?
.mp4MPEG-4 Part 14 universal video container. MP4 files are widely utilized across desktop applications and digital workflows, but may require conversion when sharing with recipients who lack native viewing software.
What is a MP3 file?
.mp3Standard compressed digital audio format. Converting to MP3 format ensures universal compatibility across modern browsers, mobile devices, and third-party software suites.
MP4 to MP3 conversion settings explained
Optimizing audio and video transcoding settings from MP4 to MP3:
- Audio Bitrate: Standard 128 kbps is optimal for voice; 192 kbps or 320 kbps delivers near-lossless acoustic fidelity for music.
- Sample Rate: 44.1 kHz matches CD audio standards, while 48 kHz aligns with modern video production soundtracks.
- Stream Copy vs Re-encode: Direct stream extraction finishes in milliseconds without generational loss.
Frequently asked questions about MP4 to MP3
What audio bitrate is used for the extracted MP3?
The engine extracts audio at crisp 192 kbps or 320 kbps MP3 quality with standard 44.1 kHz / 48 kHz stereo sampling.
Does extracting audio delete my video file?
No, your original video remains untouched on your device. A separate MP3 audio file is generated for download.
Can I convert long video files without limits?
Yes! Because processing executes directly on your machine hardware via WebAssembly, there are no artificial file length paywalls.
Is my video transmitted over the internet?
No. FFmpeg compiles to WebAssembly and processes the video entirely in local browser RAM without network transfers.