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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%

Change audio speed — WMA files, without uploading

Speed a track up or slow it down, starting from WMA audio — here in this tab, with nothing uploaded.

Speeding up a lecture or slowing down a phrase to learn it are private acts. They do not need a server.

Does this work with WMA files?

Yes — that is what this page is set up for. WMA is a Windows Media format that is awkward almost everywhere else.

Will voices sound strange?

Not if you keep the pitch. Speed and pitch are separate here.

How far can I push it?

Speech stays intelligible up to about double. Past that it depends on the speaker.