MP4 to MP3 Converter
Extract MP3 audio from an MP4 video for free, entirely in your browser. No upload, no watermark, no size limit beyond your device’s memory.
What is MP4?
MP4 (MPEG-4 Part 14) is the default container format for video from phones, cameras, screen recorders, and video-conferencing apps. It bundles a video stream (usually H.264/H.265) with one or more audio tracks (usually AAC) in a single file.
Why convert MP4 to MP3?
Converting MP4 to MP3 discards the video stream and keeps only the audio, producing a file that’s a fraction of the size and plays in any music app, car stereo, or podcast player. It’s the standard move when you filmed something on video but only need the sound — a lecture, an interview, a live set, or a voice memo.
How to convert MP4 to MP3
- Drop your MP4 file. Drag and drop a MP4 file, or click to browse. First use loads the ffmpeg.wasm engine (~31 MB, cached in your browser after).
- Confirm output is MP3. This page pre-selects MP3 as the output format — change it in the format picker if you’d rather export something else.
- Set quality and convert. Pick a quality or bitrate preset, then click Convert. Processing runs locally on your device and typically finishes in well under a minute for short files.
- Download. Click Download to save your MP3 file. Nothing was ever uploaded to a server.
Your file never leaves your browser — conversion runs locally via ffmpeg.wasm, not on a server.
Use Cases
- Extract a podcast episode from a recorded video call
- Rip the audio from a concert or DJ set you filmed
- Pull narration out of a screen-recorded tutorial