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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 without uploading it

See what a file actually is — 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.

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.

Why does the format not match the extension?

It happens more than you would think. The extension is a label; what is inside is what actually matters, and that is what this reads.