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Why this runs on your computer

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 video — WebM files, without uploading

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

How to convert video (WebM)

Drop your WebM file in.
Pick the format you need.
Save the converted file.

Why this one stays private

Converting a video elsewhere means uploading the whole thing, waiting, and trusting a stranger's server with footage that may not be yours to hand over. The conversion happens here instead.

Questions

Does this work with WebM files?

Yes — that is what this page is set up for. WebM is small and made for the web, though older players and editors ignore it.

Does converting lose quality?

Re-encoding always costs something. Going to a modern format at a generous bitrate costs very little; going through several conversions in a row is what does real damage.

Which format should I pick?

MP4 if you are not sure — it plays everywhere. WebM if it is for a web page and you want it small.

How to convert video (WebM)

Why this one stays private

Questions

The same tool, other formats