How to Convert MP4 to MP3 Locally and Securely

Extracting audio from a video shouldn't require downloading sketchy software or waiting in long server queues. Modern browsers now have the power to transcode media files locally.

The Magic of FFmpeg in the Browser

By compiling the industry-standard FFmpeg library into WebAssembly (WASM), we bring powerful media transcoding directly to your browser. Your large MP4 video files are processed on your local CPU to extract crisp MP3 audio tracks.

Zero-Upload Privacy

Podcasters and journalists dealing with unreleased interviews or sensitive recordings can now extract audio without fear of data interception. 100% local processing means zero upload delays and absolute confidentiality.