An automated voice can read an audio-description script, but it cannot decide which visual details are essential to a person who cannot see the screen. That judgment belongs in the editorial design.
Audio description is not ordinary narration
The W3C Web Accessibility Initiative describes audio description as conveying visual information necessary to understand a video, such as actions and text displayed on screen. An explainer in which the narrator already describes every essential chart might need less separate description than a drama with silent visual clues. Start by listing information a listener would miss without sight, not by asking a TTS service to summarize random frames.
Design for timing and comprehensibility
Write short descriptions that fit around existing dialogue. Avoid interrupting an important quote, sound effect or moment of emotion. If silence is insufficient, consider a described alternative version or a more substantial editorial restructure. W3C discusses integrated narration, separate versions and separate track or timed-text approaches, each with player-support implications. The output can be high-quality even with a human voice and no AI at all.
Using synthetic speech appropriately
An authorized TTS system can speed revisions, maintain consistent voice and support multilingual alternatives, but it can mispronounce names or sound falsely cheerful in a tragic scene. Choose a voice whose rights permit the distribution and do not imitate the original actor without approval. Place descriptions into the production session before final mastering, not as compressed audio pasted on top of finished dialogue.
Test with people who need the feature
Ask blind and low-vision viewers to identify critical relationships and events without access to the picture. Note confusion when descriptions are too dense, vague or late. Check that on-screen dates, currency labels and diagrams are described where they matter. A machine-generated transcript of the original dialogue is not equivalent to a description of the visual information. Preserve a script and editorial revision log.
WCAG status and commercial production
W3C distinguishes WCAG 1.2.3, which allows an alternative for time-based media or description for prerecorded synchronized media at Level A, from 1.2.5, which addresses audio description at Level AA. This article does not determine the law for any country or platform. Where capacity is limited, incorporating descriptions into the original script may be easier than retrofitting an existing documentary. Get the media owner’s permission for added audio tracks and any cloned narration.
Publication scope, rights and cost caveats
Research cutoff: 25 October 2026. The material above distinguishes provider documentation from independently measured behavior; no hands-on evaluation, legal clearance, voice-owner consent, commercial license purchase or model benchmark is claimed. Production teams must verify the specific API or installed version, account entitlement, input/output rights and destination market before release. Monetary plan amounts and metering tiers are not asserted here; the canonical pricing ledger belongs to AI 10. Missing release dates, exact rates and sample-rate capabilities are intentionally not inferred.