Dialogue Boost is a Prime Video feature that uses AI to identify specific moments in a film or show where dialogue is difficult to hear over background sound — and then selectively increases the clarity of speech at those moments only. It launched in April 2023 and is now available in seven languages.

Unlike simple volume controls, Dialogue Boost uses AI to analyze the audio track and isolate the speech signal from music, effects, and ambient noise, targeting enhancement precisely where speech intelligibility drops. Viewers can choose between Medium and High boost levels. All audio processing runs in the cloud using AWS services including Amazon ECS and Amazon Fargate. The feature launched in English for select Amazon Originals and as of July 2025 supports French, Italian, German, Spanish, Portuguese, and Hindi in addition to English. Prime Video describes this as exclusive to its platform among major streaming services.