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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%

Merge audio without uploading it

Join several tracks into one — here in this tab, with nothing uploaded.

Joining recordings means every one of them has to be in one place. That place should be your own computer.

Do the tracks need the same format?

It is cleanest when they do. Mixed formats are brought into line first.

Can I reorder them?

Yes — drag them into the order you want before saving.

Is there a gap between them?

Not unless you ask for one.