1
Upload your MP4 video
Click or drag your MP4 file into the upload area.
- The tool only accepts MP4 video files
- Your file must be 50 MB or smaller
MP4 to MP3 Converter
Extract audio from a local MP4 file in your browser. This tool does not download videos from websites.
Extract audio from your MP4 video files directly in your browser. Our MP4 to MP3 converter is fast, private, and gives you full control over your output bitrate.
No installation
Fast processing
Browser friendly
Privacy-aware
Features
Extract audio tracks from local MP4 video files directly in your browser
100% private client-side processing using Web Audio API — video files never leave your device
Choose your preferred bitrate: 128 kbps (Speech/Podcasts), 192 kbps (Balanced), or 320 kbps (High Fidelity)
Preserves original audio sample rate (44.1 kHz / 48 kHz)
Supports MP4 video files up to 50 MB in size
Free to use with instant browser audio extraction
How It Works
2
Select the MP3 bitrate
Choose your preferred audio quality from the dropdown menu (128 kbps, 192 kbps, or 320 kbps).
- The default setting is 192 kbps, offering a good balance of quality and file size
- The tool will automatically check if your video has a valid audio track
3
Convert and download
Click 'Convert MP4 to MP3'. The conversion happens entirely in your browser, and will time out if it takes longer than 90 seconds. Once done, download your new MP3 file.
- Your file is processed locally and securely
- The output is a standard MP3 audio file
Common Use Cases
Podcasts, Interviews & Lectures
Extract spoken voice tracks from recorded Zoom meetings, interviews, or lectures for listening on the go or uploading to AI transcription.
Music & Audio Tracks
Convert recorded video performances or personal music clips into high-bitrate MP3 audio files for media player playback.
Saving Device Storage
Keep only the essential audio track from long videos, saving significant disk space on your phone or laptop.
Tips & Best Practices
Choose the Right Bitrate
Select 320 kbps for the highest audio fidelity, or choose 128 kbps if you want a smaller file size for spoken-word content like podcasts.
Completely Private
Your MP4 video is processed locally in your browser. It is never uploaded to any server, ensuring complete privacy.
Built-in Audio Validation
The tool automatically checks if your MP4 file contains a valid audio track before attempting the conversion, saving you time.
MP4 to MP3
Convert MP4 to MP3 Offline
This tool is powered by WebAssembly, meaning it extracts the audio directly inside your browser. No massive video uploads required, saving you tons of time and data.
Features
- Lightning fast local processing
- No uploading large videos
- High bitrate MP3 output
- 100% private and secure
Frequently Asked Questions
Does it take long to convert a large video?
Because the conversion happens locally on your device without uploading the video to a server, the process is incredibly fast.