Video to Audio Extractor & Trimmer
Extract and trim audio tracks from MP4, MOV, and WebM videos locally in your browser. Export uncompressed 16-bit PCM WAV or preserve original audio quality via M4A/WebM stream copy.
Method and assumptions
Input video files are demuxed via Mediabunny's BlobSource with the video track discarded (video: { discard: true }). When WAV is selected, decoded audio samples are written as uncompressed 16-bit PCM into a RIFF WAVE container. When M4A or WebM Audio is selected, the engine prefers lossless stream-copy of the native audio packets within the [start, end] range, falling back to WebCodecs AAC or Opus encoding when container transcoding is required.
Common mistakes and edge cases
If the source video is muted or contains no audio track, the tool immediately reports that no audio stream is present rather than generating an empty file.
How to use
- Drop an MP4, MOV, or WebM video with an audio track into the workspace (or load the 3-second sample clip).
- Select WAV (.wav), M4A / AAC (.m4a), or WebM Audio (.webm).
- Set your Start time and End time in seconds to extract either the full track or a trimmed range.
- Click Extract audio, listen in the built-in audio player, and click Download.
Example
Load a 3-second video with audio, set Start time to 0.5s and End time to 2.5s, choose WAV or M4A, and download the 2.0-second audio track.
Frequently asked questions
- Does extracting to M4A or WebM re-encode the audio?
- When 'Prefer lossless audio stream copy' is enabled and the source video's audio codec is compatible with the target container, packets are remuxed directly without re-encoding.
- What happens if a video has no audio track?
- The tool inspects the container tracks immediately upon load and displays a clear notice if no audio stream is present.
RELATED TOOLS
- Video to Animated GIF & WebP Optimizer
Convert MP4, MOV, and WebM clips into palette-optimized Animated GIFs or Animated WebP.
- Video Trimmer & Cutter
Trim MP4, MOV, and WebM videos locally via lossless stream-copy or frame-accurate re-encode.
- Video Cropper & Social Resizer
Crop and resize videos to 9:16, 1:1, 16:9, or 4:5 with synchronized audio.
FROM THE PORTFOLIO
Explore the RoninDesk portfolio.
This tool is provided for general informational and workflow purposes only. It does not constitute financial, investment, tax, or professional advice. All calculations run in your browser; no input data is transmitted or stored.