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There is no upload: The work happens in this tab. Your file never travels, so there is no copy of it anywhere but your own disk.
Nothing to delete later: Sites that upload promise to delete your file afterwards. That promise only matters because the file was theirs to hold.
It works with the Wi-Fi off: The honest test. Turn off your connection and the tools keep working, because everything they need is already here.

Drop your audio hereto load the tools

Nothing is uploaded — the tools run right here

Applies to every loaded image

Look Strength 100% Brightness Contrast Saturation Vibrance Vignette

Max width Format Shape

Shape Size Across Down Border

Text Where

100%

Extract audio from video without uploading it

Pull the sound out of a clip — here in this tab, with nothing uploaded.

Pulling the audio out of a video is often the first step in transcribing it — which means the video usually contains a conversation. It stays here.

Does this reduce the quality?

Not if you keep the original codec — the track is copied out as it is. Converting it afterwards is where quality is spent.

Which format should I choose?

MP3 to share it, WAV or FLAC if it is going into an editor.

Does the video change?

No. The original is untouched; you get a new audio file alongside it.