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Click or drop a video here
The audio track comes out as MP3
Quick answer: To convert MP4 to MP3 free, drop your video below and click Extract MP3. FFmpeg running in your browser strips the video track and encodes clean MP3 audio – a lecture, song or voice memo becomes a small audio file in about the clip's own duration, with nothing uploaded.
A recorded lecture you want to listen to while commuting, a voice note trapped inside a screen recording, a song from your own video – extracting the audio track shrinks the file 10x and makes it playable in any music app.
This converter runs FFmpeg in WebAssembly, so your video never uploads anywhere – which matters when the recording is a private meeting or class. It accepts MP4, MOV and WebM (including recordings from our own Screen Recorder and Voice Recorder tools) and outputs a standard MP3 at good quality.
How to convert a video to MP3
- Add a video file – MP4, MOV or WebM.
- Pick audio quality (the default 190 kbps VBR is transparent for speech and most music).
- Click Extract MP3; the engine loads once (~31 MB) then converts.
- Preview the audio in-page and download the MP3.
Why use the GadgetsFocus mp4 to mp3 converter?
- Extracts audio from MP4, MOV, WebM and more.
- Real MP3 (LAME) encoding at selectable quality.
- Completely private – no upload, works offline after first load.
- In-page audio preview before downloading.
- No duration caps, watermarks or accounts.
Honest limitations
- Conversion runs at roughly the clip's own length on typical hardware – a 30-minute lecture takes a while on a phone.
- Browser memory limits practical input size to a few hundred MB.
- If a video has no audio track at all, you'll get a clear error rather than a silent file.
- Respect copyright: extract audio only from content you have rights to.
Frequently asked questions
What quality is the MP3?
The default setting encodes variable-bitrate MP3 averaging ~190 kbps – indistinguishable from the source for speech and near-transparent for music. A smaller 128 kbps option exists for long lectures.
Can I convert a WhatsApp video to audio?
Yes – save the video from WhatsApp, drop it here, extract, done. Handy for turning video voice messages into shareable audio.
Does it work with iPhone MOV files?
Yes. FFmpeg decodes virtually every mainstream container and codec, including HEVC MOVs, and outputs universal MP3.
Why not just rename .mp4 to .mp3?
Renaming doesn't change the file – it stays a video container that music apps reject. This tool genuinely decodes the audio stream and re-encodes it as real MP3.
Is my video uploaded to a server?
No. The whole conversion happens inside your browser tab; you can watch the network panel show zero upload traffic.
Related tools: Video compressor · Video trimmer · Voice recorder · Text to speech
Last updated: July 11, 2026. Built and tested by the GadgetsFocus team on Chrome, Edge, Firefox and Safari (desktop & mobile). Everything on this page runs locally in your browser — we never see, store or transmit your files.