Synthesia's AI Script Assistant writes and optimizes the video script before the avatar ever appears

Most posts about Synthesia focus on the avatars. I want to write about the AI Script Assistant because it is the feature that most improved the quality of what we produce rather than just the speed.

The problem with using Synthesia for sales enablement content was not the avatar quality or the production speed. It was that the scripts we were feeding into it were not good. Sales messaging written by sales people tends to be too long, too feature-focused and poorly paced for a video format. The avatar delivered it faithfully and the result was technically professional-looking but not compelling.

The AI Script Assistant in Synthesia analyzes your script and gives you suggestions for improving engagement. It flags sections that are too long, identifies where the narrative loses momentum, suggests restructuring for better viewer retention and rewrites passages that are not landing properly. It is not a generic grammar checker. It is giving you feedback specific to video script format and what keeps someone watching rather than clicking away.

We now run every script through the Script Assistant before any production step. The time we spend on script quality upfront is paid back in content that actually performs when we publish it. Our average view completion rate on Synthesia-produced content improved noticeably after we started treating the script step seriously.

The 120-plus language translation with lip-sync adjustment handles the localization step after we have a strong English script.