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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%

Check media file info — M4A files, without uploading

See what a file actually is, starting from M4A audio — here in this tab, with nothing uploaded.

Inspecting a file is the one job where uploading is most obviously absurd: you would be sending the whole thing away to be told what it is.

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.

What does it tell me?

Format and codec, dimensions, frame rate, bitrate, duration, audio channels and sample rate — what the file is made of.

Does this change my file?

No. This tool only reads. Nothing is written and nothing is saved.