MP4 to MP3
Extract audio from any video — free, in your browser
100% free Browser-only processing Files never leave your device
Upload Video
Drop video here or click to upload
MP4, MOV, AVI, MKV, WebM
Result
Upload a video to extract audio
Loading FFmpeg...
Original video
Audio file
Files processed locally — never uploaded
Also try: AI Humanizer · Summarizer · Rewriter 3 free uses/day
How It Works
1
Upload your video
Drop a video file or click to browse. MP4, MOV, AVI, MKV, WebM supported.
2
Choose audio format
Select MP3, WAV, or AAC. Adjust bitrate for quality vs. file size.
3
Download audio
Preview the extracted audio, then download.
FAQ
How does MP4 to MP3 conversion work?
FFmpeg WebAssembly runs in your browser and strips the video track, keeping only the audio. The audio is re-encoded to your chosen format (MP3, WAV, or AAC). No data is uploaded.
What video formats are supported as input?
MP4, MOV, AVI, MKV, WebM, and most common video formats. Any video with an audio track can be converted.
What audio formats can I output?
MP3 (default, most compatible), WAV (uncompressed, highest quality), and AAC (small file, good quality). Choose based on your needs.
What bitrate should I choose?
128kbps is fine for speech and podcasts. 192kbps is good for music. 256kbps and 320kbps are for audiophiles who want near-lossless quality.
Is the audio quality affected by the conversion?
Slightly — re-encoding always involves minor quality loss. For music, use 256kbps or higher. For speech, 128kbps is indistinguishable from the original. WAV output is lossless.
Is my file uploaded to a server?
No. FFmpeg runs entirely in your browser via WebAssembly. Your video never leaves your device.
Why does the first conversion take longer?
The FFmpeg WebAssembly engine (~31MB) downloads on first use. Cached after that — subsequent conversions start instantly.
Can I extract audio from a YouTube video?
Not directly from YouTube. Download the video first, then upload it here. Or use our <a href="/ai/video/youtube-summarizer">YouTube Summarizer</a> for text transcripts.
Does it work on mobile?
Yes. Audio extraction is relatively fast. Most phones handle it well for videos under 10 minutes.
What is the file size limit?
Depends on your device memory. Most handle videos up to 500MB. Audio extraction is faster than video compression since no re-encoding of video is needed.
How long does extraction take?
Fast — usually a few seconds for a 5-minute video. Audio extraction is much faster than video compression because only the audio stream needs processing.
Can I convert multiple files at once?
One at a time currently. After downloading, click "Change file" to process the next video.
What is the difference between MP3, WAV, and AAC?
MP3: most compatible, good compression. WAV: uncompressed, largest file, lossless quality. AAC: better compression than MP3, used by Apple/YouTube. For most uses, MP3 at 192kbps is the best balance.
Is it really free?
Yes. Completely free, no limits, no signup required.
Can I pay with cryptocurrency?
Video tools are free. For AI writing tools with premium tiers, we accept USDT, USDC, BTC, ETH. Plans start at $9.99/month.
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Coda One's MP4 to MP3 converter extracts audio from any video file using FFmpeg WebAssembly in your browser. Supports MP4, MOV, AVI, MKV, WebM input and MP3, WAV, AAC output. Choose your preferred bitrate. No uploads, no servers — complete privacy.