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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%

Trim audio — M4A files, without uploading

Cut a track down to the part you need, starting from M4A audio — here in this tab, with nothing uploaded.

Trimming a recording usually means cutting something out of it. Uploading the whole recording first would hand over the very part you are removing.

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.

Can I cut from the middle?

Yes — set the handles around what you want to keep.

Is the cut part recoverable?

Not from the saved file. What you save contains only what you kept.