MP4 to MP3 Converter

MP4 → MP3 Converter — Robust (LameJS + Tests)

MP4 → MP3 Converter — Robust (LameJS + Tests)

This page converts video/audio → MP3 using the browser's decoder (WebAudio) and lamejs for MP3 encoding. It avoids ffmpeg.wasm and its environment problems. Use the built-in tests to verify the encoder in your browser.
Drag & drop file here or click to choose
Idle
Notes / Troubleshooting
  • Browser must be able to decode the file's audio track (most MP4 with AAC are supported in Chrome/Edge/Firefox). If decoding fails, you'll see an explicit error in logs.
  • This client-side approach avoids ffmpeg.wasm; if you need ffmpeg functionality (complex formats, trims), I can add a server-side or WASM fallback later.
  • Large files use a lot of memory — for >200 MB files consider trimming before converting.

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