100% on-device · nothing uploaded
Video to MP3 — extract audio
Drop in a video and get its audio as an MP3. The extraction runs in this tab on your own device, so the video never leaves it — useful for lectures, interviews, music videos and podcasts you already have.
How to use it
- Choose a video — MP4, MOV, WebM, MKV and more all work.
- Pick the MP3 quality: 192 kbps is a good default, 320 the highest, 128 the smallest file.
- Press Extract MP3 — the first run downloads the audio engine once, then the MP3 downloads.
The soundtrack inside a 4K video is a modest stereo file
Resolution and audio quality are unrelated, and people are routinely surprised by how little audio a large video holds. A 4K clip from a phone or a mirrorless camera almost always carries plain two-channel AAC at 44.1 or 48 kHz, between 96 and 256 kbps. Across an hour that is a few tens of megabytes inside several gigabytes of picture. Extraction is not compressing anything down; it is discarding the ninety-odd per cent that was never audio.
That bears directly on which bitrate to pick. The output cannot hold information the source never carried, so encoding a 128 kbps original out at 320 kbps yields a file two and a half times the size describing the same sound. Most players will show you the source rate: VLC lists it under Codec Information, and file properties show it on Windows and macOS. Matching it, or sitting one step above, wastes nothing.
Two lossy codecs that disagree about what to throw away
AAC and MP3 both discard sound a psychoacoustic model predicts will be masked by louder sound nearby, but they model that masking differently and split the signal with different filterbanks. Extracting to MP3 means the MP3 encoder is analysing audio that already had holes cut in it under another set of rules, then cutting its own on top. The compound effect surfaces first in cymbals, sibilance and applause, the dense high-frequency material both codecs find expensive.
At sensible bitrates this stays mild and most listeners never catch it. The case worth thinking about is material heading for more compression downstream, such as an upload to a platform that re-encodes on ingest. Each pass works on the damage left by the last, so the fewer lossy steps between camera and listener, the more room the final encode has.
Questions
Is my video uploaded to extract the audio?
No. The audio engine loads into your browser and does the work on your device, so the video never leaves this tab. Most free "video to MP3" sites upload your file to a server — a problem if it is personal or copyrighted material you own.
Which MP3 quality should I pick?
192 kbps is a good balance of quality and size for speech and most music. Choose 320 kbps for the best MP3 quality, or 128 kbps for the smallest file — bear in mind you cannot add quality the source audio never had.
Why is the first extraction slow?
The audio engine (about 30 MB) is downloaded once on the first run and then cached, so later extractions are much faster. The extraction itself is real work on your device and takes a few seconds.
Can it handle a video with no sound?
No — if the video has no audio track there is nothing to extract, and the tool will tell you so rather than hand you an empty file.
Is it legal to extract audio from a video?
For your own recordings, and for personal use of media you own, generally yes. Extracting and redistributing copyrighted audio you do not have the rights to is not — this tool does not change what you are allowed to do with the result.
Updated 2026-07-20. Runs fully in your browser — nothing is uploaded.