Online Tool Store
Video to MP3 Converter
Extract the audio track from any video file and save it as an MP3. Runs entirely in your browser — your video is never uploaded to a server.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Loading the sample video — choose your own file to replace it.
How it works
- Choose a video file and the MP3 quality you want.
- Click Extract MP3 — the audio track is pulled out and encoded to MP3.
- Preview it right on the page, then download the MP3 file.
How the extraction works
A video file is a container holding separate video and audio streams muxed together. This tool loads FFmpeg — compiled to WebAssembly so it can run inside your browser tab — reads the container, discards the video stream entirely, and re-encodes the audio stream with the LAME MP3 encoder at your chosen bitrate:
ffmpeg -i input.mp4 -vn -acodec libmp3lame -b:a 192k output.mp3
-vn ("no video") is what makes this an extraction rather
than a conversion — the video frames are never decoded or re-encoded,
only demuxed and thrown away, which is also why it's fast even on a
large file.
FAQ
Does my video get uploaded anywhere?
No. The whole extraction runs in your browser using ffmpeg.wasm, a WebAssembly build of FFmpeg — your video file never leaves your device or touches a server.
What video formats can I convert?
Any format your browser can hand off as a file — MP4, MOV, WebM, MKV, AVI, and more — since the conversion engine bundles its own demuxers rather than relying on the browser to decode the container.
Why does the first conversion take a moment to start?
The first click loads a ~30MB WebAssembly conversion engine, since it's only fetched when you actually use the tool, not on every page visit. Your browser caches it, so later conversions on this page start instantly.
Can I control the MP3 quality?
Yes — choose 128 kbps (smaller file), 192 kbps (a good default), or 320 kbps (highest quality, largest file) before extracting.
Is there a video length or file size limit?
No hard limit is enforced, but everything runs on your device's own CPU and memory, so very large or very long videos may be slow or run out of memory on lower-powered devices. It works best for clips up to a few hundred MB.
Does this modify or re-encode my original video?
No — your original video file is read into memory, its audio track is extracted and encoded to MP3, and that's it. The source file on your device is never changed.
How we compare
| Feature | Online Tool Store | CloudConvert | VLC media player |
|---|---|---|---|
| No file upload — runs in your browser | ✓ | ✗ | ✓ |
| No sign-up or install | ✓ | Free tier is upload-limited | ✗ (desktop app) |
| Preview the MP3 before downloading | ✓ | ✓ | Manual (open the file after export) |
| Adjustable MP3 bitrate | ✓ | ✓ | ✓ |
VLC can do this too, but only after you've installed it and learned its export menu; CloudConvert is convenient but means uploading your video to a third party. If you just want the MP3 without installing anything or sending your file anywhere, Video to MP3 Converter gets you there faster.