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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 — M4A files, without uploading

Speed a track up or slow it down, starting from M4A 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 M4A files?

Yes — that is what this page is set up for. M4A is the Apple container for AAC, and what iTunes and Voice Memos produce.

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.