Heygen 3
Heygen 3 turns a text prompt into a video clip. Pick a mode, write the prompt, run it in the studio.
Input
FormPrompt*
Orientation
Result
PreviewMotion preview, not Heygen 3 output
Credits·~90s
What Heygen 3 is for
Heygen 3 turns a written prompt into a short video clip. Runtime is about 90 seconds and compute is Credits. This page is the text-to-video mode only. It is a clip generator, not a full training-video editor.
Heygen 3 is cheap enough that a generation usually fits the free Knowlify plan's credits. A typical run is about 90 seconds.
Pick Heygen 3 for text to video at Credits and ~90s. Compare it with Ai Avatar, Argil Avatar on the related cards below if you need a different look, speed, or input type.
How to use Heygen 3
- 1. Write a clip prompt for Heygen 3: subject, motion, and where the camera sits.
- 2. Run it. The studio generates the clip with Heygen 3.
- 3. Keep going in the studio to turn a document into a full narrated video.
What you need
- A prompt that names the subject, camera move, and lighting.
- Orientation (landscape, portrait).
- Optional toggles on this model, such as audio or quality flags.
Example prompt
a watch movement macro, jewels, oil, black background, night street photography, neon, rain, grain, no text, no watermark, slow cinematic camera move, natural motion
Frequently asked questions
How do I run Heygen 3?
Run Heygen 3 on Knowlify at /generate/heygen-3. Write the prompt on this page and it opens in the studio, where Heygen 3 generates a short clip. The same studio also turns documents into full narrated videos.
Where can I use Heygen 3 online?
On Knowlify (knowlify.com/generate/heygen-3). You do not need a separate playground. Heygen 3 runs in the studio next to document-to-video.
Can I make a longer video with Heygen 3?
Heygen 3 itself produces a short clip. On Knowlify you can take that output, or skip it and upload a document, and generate a full narrated video with a script you can edit.
What do I need to run Heygen 3?
A text prompt is enough. Heygen 3 generates the clip from that description in the studio.
How long does Heygen 3 take?
Plan on about 90 seconds for a typical run, then whatever queue time the studio has. Video models sit at the high end of that range.
What does Heygen Video Agent cost?
Knowlify charges this as credits, at the compute cost.
What is Heygen Video Agent best for?
Generate videos with a single prompt. Describe what you want in plain text, and the agent handles avatar selection, scripting, scene composition - all in one. It turns a text prompt into a video clip.
Do I need an account to use Heygen Video Agent?
Yes, a free account. The prompt you write here is waiting for you when Heygen Video Agent opens in the studio.