Audio tools
Tools for the moment a video holds the sound you need: pull the audio track out and hand it over in the format your player, editor or upload form expects. Decoding and encoding run in your browser — nothing to install and nothing to wait for.
The sound leaves with you, not without you
Open a video, choose an output format, and the page decodes the audio track with your browser's own decoder, then encodes it with the settings you picked. The file is read on your device and written back to your device — there is no upload step, and closing the tab leaves nothing behind.
Formats are honest by construction: what you can pick is exactly what your browser can produce, and the container is always the one named on the button.