What Browser-Based Video Processing Actually Means for Privacy

“Browser-based” tells you where the interface opens. It does not tell you where the video is processed. A website can edit media on your device, upload it to a server, or split the work between both.

Unseen offers two explicit modes. Local processing keeps the media-processing work in the browser. Cloud processing sends the video for remote computation.

Think of the browser as an application

A modern browser can run substantial software. It can read a selected file, decode images from a video, detect faces, draw effects, and create a download.

Selecting a file gives the page access to that file for the task. It does not automatically mean a network upload has occurred. Conversely, an interface that feels instant can still be sending data in the background.

That is why the mode and implementation matter more than whether the button says Import or Upload.

Separate three kinds of traffic

First, the website needs to send software to your browser. Scripts and detection-model downloads are expected before local processing can work.

Second, a service may make requests for sign-in, billing, or operational telemetry. Those are separate privacy questions from source-video handling.

Third, cloud processing requires transferring media. If your requirement is that the source never reach a server, this third category is the decisive one.

Do not expand “the video stays local” into “the website never makes a request.” The two claims are different, and Unseen's privacy documentation discusses other service data.

Make the boundary visible in Unseen

Select Local processing on the import screen. For an offline check, use Prepare for offline use, wait until the engine is ready, and disconnect before choosing a harmless test video.

If that test can complete and produce an export with the connection off, you have observed the local path operating without a live network. Keep the prepared tab open for subsequent work.

You can follow the step-by-step offline guide if preparation fails or the browser has cleared its cache.

What this does not protect

Your computer may already sync its camera or downloads folder to a cloud service. A browser extension may have permissions you do not want. The original file might still exist on a shared drive.

Local processing avoids a media upload to Unseen for processing. It does not change those independent copies or secure the operating system.

For most people, the useful decision is simple: choose local when you want the face edit performed on your own device, and check the destination of the resulting download before sharing it.