MP4 to MP3
Drop an MP4 (or several). We pull the audio track and re-encode it as MP3 right here in your tab. No upload, no signup, no queue. The video never leaves your device.
drop your MP4 here
or click to pick. We accept MP4, MOV, WebM, MKV too.
How it works
Your browser already knows how to read an MP4 — it's the same code that plays video in a <video> tag. We load a slim WebAssembly build of FFmpeg the first time you use the tool, demux the audio track (usually AAC), and encode it to MP3 with the bitrate you pick. The whole pipeline runs inside your tab. The first conversion takes a few extra seconds while the codec loads (~3 MB); after that, conversions are fast and the codec stays cached.
What gets extracted
Whatever audio is in the MP4 — usually a single AAC stereo track. If the MP4 has multiple audio tracks, we take the first one. Subtitles, video frames, and metadata are dropped. The result is a clean MP3 at the bitrate you chose.
What about MOV, WebM, and MKV?
The same tool handles them. iPhone .mov files, screen recordings as .webm, and .mkv from desktop tools all work — just drop them in the same dropzone.
FAQ
Is this MP4 to MP3 converter free?
Yes. No signup, no daily limit, no watermark.
Does my MP4 get uploaded to a server?
No. Conversion runs in your browser. Open this page, switch to airplane mode, drop a file — it still works.
Can I convert multiple files at once?
Yes. Drop several MP4s and you'll get them all back as a zip of MP3s.
What's the maximum file size?
Around 500 MB on a typical laptop. Some larger files work but past 1 GB the browser starts running out of memory.
Why does the first conversion take a moment?
We lazy-load the codec (about 3 MB) on first use. After that it's cached and conversions start instantly.
Can I pick the MP3 bitrate?
Yes — 128, 192, 256, or 320 kbps. We default to 192, which sounds great and keeps files small.