MP4 to MP3 Converter
Extract MP3 audio from MP4 video files online. Fast browser-based conversion with no upload required. Free and secure.
How to Convert MP4 to MP3
- 1 Upload your MP4 video file by clicking or dragging it into the upload area
- 2 Preview the video to verify it contains the audio you want
- 3 Select your preferred MP3 bitrate for audio quality
- 4 Click 'Extract Audio' to convert the video to MP3
- 5 Download your MP3 audio file when extraction is complete
Frequently Asked Questions
How does browser-based video processing work? ▼
MagicKit uses FFmpeg compiled to WebAssembly (WASM). This brings professional video editing capabilities directly to your browser.
What video formats are supported? ▼
MP4, WebM, MOV, and AVI. Some tools also support MKV and other formats.
Is there a file size limit for videos? ▼
We recommend files under 500MB for optimal browser performance. Larger files will work but may be slower.
Why does video processing take time? ▼
Video encoding is computationally intensive. Processing happens on your device, so speed depends on your computer's capabilities.
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Last updated: January 15, 2026 · v2.1