HeyGen is an AI video platform made by HeyGen, Inc. Its core product is the AI avatar: a digital presenter, made from a recording or a photo of a real person or from ready-made presenters, that speaks any script with matching lip movements.
A user or a program gives a script, an avatar and a voice, and HeyGen renders the video. The avatar engines (Avatar III, IV and V) learn how a person talks and moves from one recording, and the lip-sync works at the level of phonemes (single speech sounds) in 175+ languages and dialects. Video Agent turns a short prompt into a finished video with a presenter, motion graphics and B-roll. Video translation takes an uploaded file or a YouTube link, clones the speaker's voice in another language and re-syncs the lips. Through the API a program posts a request and polls for the finished video; batch calls take up to 100 requests, and a CLI and an MCP server serve AI agents.
HeyGen is a hosted service: a web app with free and monthly subscription plans, an API billed per use from prepaid funds, and enterprise contracts.