Video → audio · Local
Extract Audio from Video
Pull a clean audio track from MP4 and other video files without uploading. Export MP3 for sharing or WAV for editing. All extraction runs locally in your browser.
Quick answer
Extract Audio from Video is a free browser tool on Knowlify. Use it below with no signup. Media files are processed on your device and are not uploaded to our servers. For narrated training videos from documents, use https://create.knowlify.com.
How it works
Three steps, no account
01
Add a video file
Drop an MP4 or other common video. The file stays on your device.
02
Choose MP3 or WAV
MP3 is smaller for sharing. WAV is better for editing.
03
Download the audio
Save the extracted track and use it in your editor or LMS.
FAQ
Questions people ask about Extract Audio from Video
Is this audio extractor free?+
Yes. audio extractor on Knowlify is free to use with no signup, no watermark, and no account required.
Do my files get uploaded to a server?+
No. Conversion and compression run in your browser with FFmpeg.wasm. Files stay on your device unless you choose to download the result.
How do I extract audio from an MP4?+
Drop the MP4 here, pick MP3 or WAV, and download. No desktop app install required.
Can I extract audio without losing sync reference?+
Yes. The full audio stream is exported. If you need a time-limited clip, trim the video first with our video trimmer.
Do I need an account?+
No. Open the tool, use it in your browser, and download or copy the result.
Does this work on Mac and Windows?+
Yes. It runs in modern desktop browsers (Chrome, Edge, Firefox, Safari). Very large media files need enough device memory.
Need a full video, not just a utility?
Extracting VO for a rewrite? Knowlify turns finished docs into narrated training videos end to end.