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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 — OGG files, without uploading

See what a file actually is, starting from OGG 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 OGG files?

Yes — that is what this page is set up for. OGG is the open, patent-free option that some players still do not handle.

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.