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MP4 to MP3 Converter
Extract MP3 audio from MP4 video — free and unlimited. No sign-up, no watermarks, no monthly limits. Adjustable bitrate. Files deleted after 1 hour. Powered by FFmpeg.
Upload your MP4 file
Drag & drop or click to browse · Max 500 MB
How to convert MP4 to MP3
Upload your file
Drag & drop or click to browse. Supports files up to 500 MB.
Choose quality (optional)
Pick your bitrate — 192 kbps is ideal for music, 128 kbps for voice.
Download instantly
Click Convert, wait a few seconds, then download your file — free.
About converting MP4 to MP3
An MP4 is a container: a video track, one or more audio tracks and metadata, wrapped together. Extracting the audio means demuxing that container and re-encoding the audio stream to MP3 — the video is discarded rather than converted, which is why this is fast even on a long file.
The audio is encoded with LAME through FFmpeg, the same encoder behind most of the audio software you already use. Bitrate is yours to choose: 128 kbps is right for speech and podcasts, 192 kbps is the sweet spot for music, and 320 kbps is for archiving where file size does not matter.
The one thing worth knowing is that MP3 is lossy and the MP4’s audio was almost certainly lossy already — usually AAC. Re-encoding lossy to lossy loses a little more. At 192 kbps and above it is inaudible to almost everyone; below that, on music, it is not.
What actually changes
- Demux, not transcode
- The video track is dropped rather than converted, so the work is proportional to the audio only.
- Encoder
- LAME via FFmpeg, at the bitrate you choose, up to 320 kbps.
- VBR
- Variable bitrate mode spends bits where the audio is complex, giving better quality per megabyte than a fixed rate.
- Metadata
- Track title and artist tags carried in the MP4 survive into the MP3 where present.
What it cannot do
Every conversion loses something. These are the limits of this one, stated up front rather than discovered in the output.
- Generational loss is real: the MP4’s audio was probably AAC, and re-encoding it to MP3 loses a little more. Choose 192 kbps or higher for music.
- Only the first audio track is extracted from a multi-track file.
- DRM-protected files cannot be read.
- Files up to 500 MB.
Frequently Asked QuestionsAbout MP4 to MP3 conversion
What bitrate should I choose?
128 kbps for speech and podcasts, 192 kbps for music — that is the point where most listeners stop hearing the difference — and 320 kbps when you are archiving and size does not matter.
Will I lose quality?
A little. MP3 is lossy and the source was almost certainly lossy AAC already, so this is a second generation. At 192 kbps and above the difference is inaudible to nearly everyone.
How long does it take?
Usually 5–30 seconds. Only the audio is processed — the video track is discarded, not converted — so length matters far more than file size.
Are my files kept?
No. Uploads and outputs are deleted within an hour, automatically.