Video to MP3 — Extract Audio from Video
Pull the sound track out of an MP4, WebM or MOV video and save it as MP3 or WAV, right in your browser. Nothing is uploaded.
How to use
- Drop a video file or click to choose one. Its length, sample rate and channel count appear once the sound track is decoded.
- Pick MP3 or WAV. For MP3 choose a bitrate; for speech, choose mono to keep the file small.
- Press Convert, listen to the result in the player and download it.
About this tool
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Drop a video and the tool decodes its sound track with your browser's own decoder, then encodes it as MP3 at the bitrate you choose or writes it as an uncompressed 16-bit WAV. The video never leaves your device; there is no server step and no queue.
The audio keeps the track's own sample rate where the file states it (MP4 and MOV usually carry 44.1 or 48 kHz; WebM audio is Opus, which is always 48 kHz), so it is not resampled for nothing. A surround track (5.1) is mixed down to stereo with the standard Web Audio speaker rules, and you can fold anything to mono for speech, which halves a WAV and lets a low MP3 bitrate go further.
MP3 is lossy: 128 kbps is fine for speech and casual listening, 192 kbps is a safe default for music, and 320 kbps is the format's ceiling. Because the track in most videos is already compressed (AAC or Opus), converting it to MP3 is a second lossy step; choose WAV if you plan to edit the audio further. A WAV of a minute of 48 kHz stereo is about 11 MB.
The whole file is read into memory, so files above 400 MB are refused. A video with no sound track, or with an audio codec your browser cannot decode, gives a message instead of a silent file. MP3 encoding uses lamejs, a JavaScript port of the LAME encoder (LGPL), which is downloaded only when you first export an MP3.
Frequently asked questions
Is the video uploaded to a server?
No. The file is read and decoded by your browser and the MP3 is encoded by JavaScript on this page. After the page has loaded it works offline.
Which bitrate should I choose?
128 kbps for podcasts, lectures and voice notes; 192 kbps for most music; 256 or 320 kbps if you want the least audible loss. The source track is usually already AAC or Opus, so a bitrate far above the original does not bring detail back.
MP3 or WAV?
MP3 is small and plays everywhere. WAV is uncompressed 16-bit PCM — about ten times larger — and is the better choice if you will edit, cut or re-encode the audio, because it adds no further loss.
Why does it say the video has no audio?
Either the file has no sound track (many screen recordings and GIF-style clips do not), or its audio codec is one your browser cannot decode — for example AC-3 or DTS in some MKV files. Try another browser, or a version of the video with AAC audio.
What happens to 5.1 surround sound?
It is mixed down to stereo using the standard Web Audio rules (centre and surrounds folded into left and right at reduced level), or to mono if you choose mono.
Is there a size limit?
Files up to 400 MB. The whole video is read into memory and its audio decoded to floating point, which for an hour of stereo audio is already well over a gigabyte.
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