MP4 to MP3 Converter
Extract MP3 audio from MP4 videos online, free and private. Choose 128–320 kbps and convert right in your browser — no upload, no watermark, no signup.
Drop a video above to extract its audio
An MP4 file is a container: video streams, audio streams, subtitles and metadata packed into one shell. Converting 'MP4 to MP3' is mostly unpacking — lifting the audio track out and re-encoding it with the MP3 codec, which every player, car stereo and editing app understands. No video data is involved, so the job is quick and light.
Most converters upload your file to a server for this. Here the browser does it natively: WebAudio decodes the sound into raw samples, and an MP3 encoder compiled to JavaScript writes them back out at the bitrate you pick. The file never leaves your device, which matters when the recording is a meeting, an interview, or something unreleased.
Bitrate decides the fidelity-versus-size trade. 128 kbps keeps spoken word comfortable at about 1 MB per minute; 192 kbps suits most music; 320 kbps is the ceiling MP3 allows, near-transparent for casual listening. The source matters too — extracting MP3 from a low-bitrate stream cannot restore what the original already threw away.
Common uses
- Pulling the soundtrack out of a tutorial or lecture so it can be listened to like a podcast, with the screen off, on a commute.
- Grabbing the audio from a phone video of a live performance or rehearsal to share as a plain sound file, small enough for any messaging app.
- Preparing voiceover material: extracting narration from a screen recording so an editor can clean up the audio without touching bulky video files.
- Converting concert footage or music videos into a music-only library for players that do not handle video files.
Frequently asked questions
- Which video formats work besides MP4?
- Anything your browser can play the sound of: MP4, WebM, MOV and most common containers. The audio track is decoded by the browser itself, so support mirrors what plays natively in your browser.
- What bitrate should I choose?
- 192 kbps is the balanced default. 128 kbps for speech and podcasts, 256–320 kbps for music you will keep. Higher bitrates produce larger files; if the source audio is already low quality, a high setting will not improve it.
- Why does my video produce no audio?
- The clip has no audio track — some screen recorders and silent exports omit it. This tool only extracts existing sound; it does not generate or recover missing audio. Check the source file by playing it first.
- Is the conversion quality lossless?
- MP3 is lossy by definition, so the output is never bit-identical to the source. At 256–320 kbps the difference is inaudible for most listeners. If you need a perfect copy of the audio, choose a lossless format instead of MP3.