Audio Converter re-encodes between MP3, AAC, M4A, WAV, FLAC, OGG, Opus and AC3. It is the “Audio Convert” tab of the audio/video workbench: pick the target format, then pick a quality of 128k, 192k, 320k or “Best”; WAV and FLAC are lossless outputs, so the bitrate selector is disabled for them.

The panel can also handle a video file that is already in the workspace: in that case it states plainly that “the video stream will be discarded and only audio will be output”. The batch button only runs on the audio files in the workspace, so it never pulls audio out of every video at once. Conversion is done by single-threaded ffmpeg.wasm inside the browser.

1. 01Select the materialchoose audio on the left of the workspace; if you pick a video, the panel says only the sound will be kept.
2. 02Pick the target formatchoose from the eight formats MP3, AAC, M4A, WAV, FLAC, OGG, OPUS and AC3.
3. 03Pick the bitratelossy formats offer 128k, 192k, 320k or “Best”; WAV and FLAC need no bitrate.
4. 04Start the conversionclick “Start conversion”, or “Convert all N audio files” when several are loaded, and download the new files when it finishes.

Output formats

only MP3, AAC, M4A, WAV, FLAC, OGG, Opus and AC3; WMA, AMR and APE can be used as decoding inputs but never as outputs.

Batch scope

“Convert all” only walks the audio files; a single selected video can have its audio extracted, but videos are not converted in bulk.

Lossy transcoding

MP3, AAC, OGG, Opus and AC3 all re-encode, so repeated conversions accumulate loss; WAV and FLAC output cannot bring back detail the source already lost.

Videos without an audio track

when a video is found to have no audio stream the button is disabled, because sound cannot be invented.

What it does not do

it does not trim, normalise loudness or split channels; use “Audio Cut and Merge”, “Loudness Normalize” and “Audio Channels” for those.

The input file is handed to ffmpeg.wasm for transcoding only locally in the browser and is never uploaded; the first use downloads about 31–32 MB of ffmpeg core from the site's asset domain or jsDelivr, and that request contains none of your media files.