MP4 to MP3
Pull just the audio out of any MP4 (or any video file) as an MP3.
drop a video here
or click to choose
Why convert MP4 to MP3?
You downloaded a music video. You want just the audio in your music player or podcast app. That's an MP4-to-MP3 conversion: drop the video stream, encode the audio as MP3, save the result.
This works for any video file we can read, not just MP4 — MOV, MKV, WebM, AVI all extract to MP3 the same way.
Which quality should I pick?
- High — V2 variable-bitrate, ~190 kbps average. Indistinguishable from the source for almost everyone.
- Medium — 128 kbps. Standard streaming quality.
- Small — 96 kbps. For voice / podcast / very long files.
FAQ
Does the MP3 sound as good as the original?
MP3 is lossy, so technically no — but at High quality (V2 VBR) the difference is below human hearing thresholds for almost all music. If you want truly identical audio, use the extract audio tool with FLAC or WAV.
Does the file get uploaded anywhere?
No. Open this page, turn off your wifi, then try a file — it still works. That's the test.
What's the maximum file size?
Browser memory is the limit. WebAssembly caps at 2–4 GB per file. Most laptops handle 1080p videos under a gigabyte comfortably.
Why is it slow on my phone?
FFmpeg-WASM runs on your CPU, not hardware video encoders. Phones have less CPU, so encoding takes longer.
Can I cancel mid-encode?
Yes. The Cancel button terminates the worker immediately. You'll wait a few seconds the next time you start.