heygen/avatar-iv

Create realistic talking avatar videos from text with HeyGen's Avatar IV engine

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HeyGen Avatar IV

Generate realistic talking avatar videos from text using HeyGen’s Avatar IV engine. Provide an avatar, a voice, and a script — get back a video of the avatar speaking your text with natural motion and expressions.

Overview

Avatar IV is HeyGen’s latest avatar engine, producing higher-quality motion, expressions, and lip sync compared to Avatar III. It supports public avatars, digital twins, and photo avatars.

Inputs

  • avatar_id — The avatar to use. Get available IDs from HeyGen’s List All Avatars API.
  • input_text — The script the avatar will speak (up to 5,000 characters).
  • voice_id — The voice to use. Get available IDs from HeyGen’s List All Voices API.
  • avatar_style — Visual framing: normal, closeUp, or circle.
  • voice_speed — Speech speed from 0.5× to 1.5×.
  • voice_emotion — Optional emotion: Excited, Friendly, Serious, Soothing, or Broadcaster.
  • caption — Enable on-screen captions.
  • width / height — Output video dimensions (default 1920×1080).

Output

Returns an MP4 video of the avatar speaking the provided text.

Use cases

  • Marketing — Create personalized video ads at scale.
  • Education — Build multilingual course videos with consistent presenters.
  • Sales — Generate personalized outreach videos.
  • Support — Produce how-to videos with a friendly face.
  • Social media — Create talking-head content without a camera.
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