Donaldson R F Extract Audio from Video
Save the soundtrack of a video as an audio file. Keep the original audio exactly as it is, or convert it to MP3, WAV, M4A, OGG, FLAC or Opus — all in your browser.
How it works
A video file is a container that holds a picture stream and one or more sound streams. This tool finds the sound stream and writes it out on its own. With Original audio, unchanged the sound is copied bit for bit, so it takes a few seconds even for a long film and there is no loss of quality. Choose another format if you need a specific file type, for example MP3 for a phone or WAV for an editor.
The work is done by ffmpeg compiled to WebAssembly. That engine is about 31 MB. It is downloaded only when you press Extract audio, checked against a known fingerprint, and stored in your browser, so the next time it starts at once. It runs in the background, so the page stays responsive, and you can press Cancel at any time.
Which option should I choose?
Original audio is best for archiving and for editing later. MP3 plays everywhere. M4A (AAC) is slightly smaller at the same quality. WAV and FLAC keep everything of the decoded sound, but WAV files are large (about 10 MB per minute in stereo). OGG and Opus are open formats; Opus is very good for speech at low bitrates.
Some older audio types (WMA, for example) cannot be saved on their own without converting; the tool then uses MP3 at 320 kbps and tells you.
Frequently asked questions
Is my video uploaded?
No. The only download is the conversion engine itself. Your video is opened directly from your disk and never sent anywhere.
The video has several audio tracks. Which one is used?
The first one. After the file has been read, a list appears where you can pick another track, such as a different language or a commentary.
What is the biggest video I can use?
The limit is shown at the top of the page. Very long videos also make the result large when you choose WAV; the tool refuses a result that would be too big to build in memory and suggests a smaller format.
Will it work with protected videos?
No. Videos protected by copy protection (DRM), such as many downloaded films or streaming-service files, cannot be read. Only use videos you have the right to use.
Can I take only part of the sound?
Yes. Type a start and stop time (for example 1:30 and 2:45) before you press the button. For finer editing, save the audio first and open it in the MP3 Cutter.
Related tools: Audio Converter, Remove Silence from Audio, Audio Speed Changer.