Vapor Tuek's Video Audio Extractor
Upload a video and download just the audio from it as WAV or MP3. Fast mode decodes the audio directly when your browser can read it. If not, realtime mode records the video's audio track and converts that capture.
Choose a video file, then hit Extract Audio.
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MP3 conversion uses the included local encoder file, so the video does not need to be uploaded anywhere; everything runs in your browser. Realtime mode takes as long as the video lasts, but it works with more browser-playable video files.