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.
Files
No files selected yet.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.
Does this upload my files?
No. Everything on this page runs locally in your browser, so your files are never uploaded to a server. Close the tab and nothing is left behind. It even keeps working if you go offline after the page loads.
This is true for every tool on this site. Curious how that works? Read how browser-side processing works.
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.