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HeyGen adds speech-to-speech conversion in its app and API

HeyGen says creators can record a line and render it in an active HeyGen instant voice while keeping words and timing. The feature is available in the app and through the API. Its developer guide limits API input to 300 seconds and an active instant voice owned by the workspace; professional clones are not supported by that endpoint yet. Voice use remains subject to consent and workspace access terms.

HeyGen

HeyGen Voice Speech-to-Speech

Audio

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Updated

2 sources

Primary source · HeyGen · October 28, 2026

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