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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 without uploading it

Cut a recording down to the part you need — here in this tab, with nothing uploaded.

Recordings are voices — interviews, voice notes, calls. A voice identifies a person, which makes an upload a much bigger deal than it looks.

Which formats can I open?

The common ones — MP3, WAV, M4A and similar.

Can I trim silence off the start?

Yes. The waveform makes the silence easy to see, so you can cut exactly where the sound begins.

Is the recording uploaded to be processed?

No. It is decoded and trimmed by your own browser; nothing is sent anywhere.