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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 file hereto convert it

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

Colours 6 Detail 1 Smooth curves

Shape Size Across Down Border

Text Where

100%

Convert audio without uploading it

Change a track from one format to another - here in this tab, with nothing uploaded.

Audio files are voice memos, interviews, recordings of people. Converting one elsewhere means uploading all of that.

Which format should I pick?

MP3 to be sure it plays. FLAC or WAV when nothing may be lost. M4A for Apple devices.

Can I convert several at once?

Yes - drop them all in, and save them one by one or together as a zip.

Can it take the sound out of a video?

Yes. Drop a video in and its soundtrack is converted to the format you pick.

Does converting lose quality?

Going to a lossless format never does. Going to a lossy one always does, though usually not audibly at the settings used here.