Private ffmpeg conversion

Convert MP4 to MP3

Extract the soundtrack from an MP4 and save it as an MP3 file. The video track is discarded, and the MP3 can only be as good as the audio already inside the source file.

Drop MP4 files here or choose files from your device

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About MP4 and MP3 conversion

MP4 files often contain AAC audio alongside video. This converter uses ffmpeg in the browser to read the MP4 container, ignore the video stream, and encode the audio as a 192 kbps MP3 for podcasts, notes, clips, and playback apps that expect an audio-only file.

This is extraction plus re-encoding, not enhancement. If the MP4 has low-bitrate, noisy, or already compressed audio, the MP3 will keep those limits and may add a little more loss from the new encode. Use the original MP4 when you still need the picture.

On the first audio conversion, the browser downloads the same-origin ffmpeg WebAssembly engine, about 31 MB, then reuses it for the rest of the queue. Your MP4 still stays on the device; the engine comes to the browser rather than the file going to a server.

FAQ

Does MP4 to MP3 keep the video?

No. This pair intentionally discards the video stream and returns one audio-only MP3 file.

Can the MP3 sound better than the MP4 audio?

No. The conversion cannot recover detail beyond the source soundtrack, and MP3 encoding is lossy.

Is the MP4 uploaded for extraction?

No. ffmpeg.wasm runs locally after the one-time engine download, so the selected MP4 is processed in your browser.

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