Is the video uploaded when you add a watermark?

No. The watermark is composited locally in your browser.

Does it stop people from stealing the video?

It lowers the willingness to re-upload it, but it cannot stop screen recording.

Trim and compress to the final cut first, then add the watermark — that avoids encoding the same file twice.

Upload a video and a PNG logo, choose a position and a size, then overlay the watermark — ideal for branding and copyright protection.

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Is the video uploaded when you add a watermark?: No. The watermark is composited locally in your browser.
Does it stop people from stealing the video?: It lowers the willingness to re-upload it, but it cannot stop screen recording.
Should I trim first or watermark first?: Trim and compress to the final cut first, then add the watermark — that avoids encoding the same file twice.