How it works

Pull the audio track from a video as MP3, M4A, OGG, or WAV, optionally trimming to just a section.

Drop any video the browser can decode (MP4, WebM, MOV, MKV, AVI). A trimmer lets you drag handles to grab just part of the audio, or leave them at the ends for the whole track. Pick a format (MP3 is universal, M4A is AAC with better quality per kilobyte, OGG is Vorbis, WAV is uncompressed). For the lossy formats, set a bitrate (128, 192, 256, or 320 kbps). First use loads ffmpeg.wasm (~25 MB) from CDN, then it's cached. Processing happens locally, no upload. The trimmer doesn't snap to keyframes for audio extraction, so you can pick any start and end down to a tenth of a second. Output filename keeps the source name with the new extension.

How to use it

1. Drop your video. MP4, WebM, MOV, MKV, and AVI all work — anything your browser can decode.
2. Trim if you want. Drag the handles to grab just a section, or leave them at the ends for the whole track.
3. Pick format and bitrate. MP3 is universal; choose 128 to 320 kbps for the lossy formats.
4. Extract and download. ffmpeg.wasm loads once (~25 MB), runs locally, and the audio file downloads.

Frequently asked questions

How do I extract MP3 from MP4 online?

Drop the MP4, leave format on MP3, hit Extract. The first run loads ffmpeg.wasm, which takes a few seconds; after that it's instant.

Can I extract just part of the audio?

Yes. Drag the trimmer handles on the video preview to set start and end, then extract just that range.

Why MP3 and not the original codec?

MP3 is the most compatible target. M4A (AAC) gives better quality at the same bitrate if your target device supports it.

Is my video uploaded?

No. ffmpeg.wasm runs in your browser, the file stays local.