Audio extraction on your own device
This tool opens the video file on your own device, locates its audio track, decodes it, and re-encodes it as an MP3 at the bitrate you choose. Nothing is uploaded: the whole pipeline, demuxing, decoding, and MP3 encoding, runs inside your browser. That is why it is unlimited and works on videos of any length, and why a gigabyte-long recording converts without a progress bar crawling through an upload first.
The audio is extracted, not re-recorded: what lands in the MP3 is the exact audio stream from the video, decoded once and encoded to MP3, with no speakers, microphones, or quality-eating detours in between.
What people use it for
Pulling a lecture or meeting recording into a podcast app, saving the audio of a concert clip, extracting dialogue for transcription, turning a music performance video into a track for the car, or archiving interviews as compact audio. Choose 320 kbps for music, 192 kbps as the general-purpose default, and 128 kbps when small files matter more than fidelity, for voice recordings the difference is barely audible.
What to expect
The converter accepts MP4, MOV, WebM, and MKV. If a video has no audio track at all, the tool says so up front instead of producing an empty file. In the rare browser where the MP3 encoder cannot load, the audio is saved as uncompressed WAV instead, so you always get your audio. For editing the video itself, the free video trimmer cuts clips without re-encoding, and the free video compressor shrinks the full video when you need the picture too.