Free Online Video to MP3
Extract audio from a video and download it as an MP3 file.
Load a video to see the audio details and estimated output size.
Decoding uses your browser's own media pipeline. Some protected or unusual codecs cannot be read; in that case try exporting the video as MP4 (H.264/AAC) or WebM first.
Extracted audio
ReadyAbout the Video to MP3 Converter
A video file usually contains two separate streams: pictures and sound. This tool extracts the audio stream and saves it as an MP3 or WAV file, which is useful for turning a lecture recording into a podcast, pulling a music track out of a downloaded video, or keeping a voice memo without the video frames. Everything happens in your browser; the video is never uploaded to a server.
How the extraction works
The tool reads the file into memory and passes it to the Web Audio API's decodeAudioData()
function. The browser demuxes the container, decodes the audio codec, and returns raw PCM samples. Those
samples are then compressed with the lamejs MP3 encoder at 128, 192, or 320 kbps, or written into a standard
16-bit WAV container. The decoded duration, channel count, and sample rate are shown so you know exactly what
was found inside the file.
MP3 or WAV?
- MP3 is compressed and much smaller. At 192 kbps it is transparent for most speech and casual music listening.
- WAV is uncompressed 16-bit PCM. It is much larger but avoids a second round of lossy compression, which matters if you plan to edit the audio further.
MP3 quality is set by the bitrate selector, while WAV uses the decoded sample rate and channel count. A 3-minute stereo track at 44.1 kHz is roughly 30 MB as WAV, compared with about 4 MB as 192 kbps MP3.
Compatibility and limits
Because decoding relies on the browser, support depends on the codecs it ships with. MP4 files with AAC audio and WebM files with Opus or Vorbis audio work in most modern browsers. MOV files may work in Safari, while proprietary or DRM-protected files will usually fail. Long videos and high sample rates consume a lot of memory, so a very large file may be rejected by the browser. If decoding fails, re-export the video as a standard MP4 (H.264 + AAC) and try again.
Frequently asked questions
Does the video quality affect the audio?
No. The tool ignores the picture entirely and decodes only the audio track. A low-quality video can still contain good audio.
Why is my MP3 longer or shorter than expected?
MP3 encoders add a small amount of padding at the start and end. The difference is usually a few milliseconds and is normal for MP3 files.
Can I extract audio from a protected streaming video?
No. This tool works only with files you can open locally. DRM-protected streams cannot be decoded this way.