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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 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%

Convert audio — M4A files, without uploading

Change a track from one format to another, starting from M4A file — here in this tab, with nothing uploaded.

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

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.

Which format should I pick?

MP3 to be sure it plays. FLAC or WAV when nothing may be lost.

Can I convert several at once?

Yes — drop them all in and they are handled together.