Online Tool Store
Video to MP3 Converter
Extract audio from MP4, MOV, MKV or WebM video as MP3, M4A, WAV or FLAC, with bitrate and trim options. Runs in your browser — nothing is uploaded.
This works right here on your device — nothing gets sent out.
or drag and drop a video file here
Loading the sample video — choose your own file to replace it.
How it works
- Choose a video file — drag and drop it in, or click to browse.
- Pick an output format — MP3, M4A, WAV or FLAC — and, for MP3 or M4A, a bitrate. Optionally set a trim start/end to extract just part of the video.
- Click Extract audio — the audio track is pulled out and encoded to the format you picked.
- Preview it right on the page, then download the 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 encoder for your chosen format — LAME for MP3, FFmpeg's built-in AAC encoder for M4A, 16-bit PCM for WAV, or FLAC. For MP3 at 192 kbps the command is:
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 audio quality?
Yes — for MP3 or M4A, choose 128 kbps (smaller file), 192 kbps (a good default) or 320 kbps (highest quality, largest file) before extracting. WAV and FLAC are lossless, so they have no bitrate setting.
Can I convert a video to WAV, M4A or FLAC instead of MP3?
Yes. Pick M4A (AAC), WAV or FLAC under Output format before extracting. MP3 stays the default because it plays almost everywhere; M4A (AAC) generally sounds better than MP3 at the same bitrate and plays natively on Apple devices; WAV and FLAC are for editing or archiving.
Will I lose audio quality?
Most videos already store their audio compressed, usually as AAC. Saving it as MP3 or M4A re-encodes it, which is a second lossy step — at 192 or 320 kbps the difference is rarely audible. WAV and FLAC keep the decoded audio without any further loss, but the files are several times larger, and neither can restore detail the original track didn't have.
What if my video has no sound?
If the file has no audio track at all, the tool tells you so instead of producing an empty file. A video whose audio track is silent will still extract — as a silent file.
Can I extract just part of the video, not the whole thing?
Yes — enter a trim start and/or end time (as mm:ss or hh:mm:ss) before extracting, and only that portion of the audio is exported. Leave both blank to convert the full video.
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.
Can I extract audio from a video on my phone?
Yes. It's a web page, so it works in a phone's browser with nothing to install, as long as the browser supports WebAssembly. Phones have less memory than computers, so for long videos, trim to the part you need first.
How we compare
| Feature | Online Tool Store | HappyScribe | Picsart | Restream |
|---|---|---|---|---|
| No file upload — runs in your browser | ✓ | No — uploads to their servers | Not stated | No — uploads to their servers |
| No sign-up needed | ✓ | ✓ | ✓ | ✓ |
| Save as MP3, M4A, WAV or FLAC | ✓ | ✓ | ✓ | MP3 only |
| Trim to a start/end time before extracting | ✓ | Separate trimmer tool | Not stated | Not stated |
| No file-size cap | ✓ | Not stated | Not stated | 2 GB cap |
Competitor features were checked on happyscribe.com/tools/convert-video-to-mp3, picsart.com/video-to-mp3 and restream.io/tools/mp3-converter in September 2026. “Not stated” means the page does not say. All three work well, but HappyScribe and Restream process your video on their servers; this tool never uploads it.