Set the Right Expectations Before Processing
Automated watermark removal reconstructs the pixels hidden by the logo. The result depends on what is moving behind the watermark and how much visual information is available in nearby frames.
A simple background may produce a cleaner result than a detailed face, small text, or fast motion. Some videos may show softness, flicker, or other reconstruction artifacts around the repaired area.
For the best evaluation, upload the clearest source file available and inspect the preview closely. No automated tool can guarantee an identical result for every video.