Where can I use Imagen 3?

Through Google's ImageFX tool at labs.google for free experimentation, or programmatically via the Imagen 3 model on Vertex AI and the Gemini API. The same prompt works across all three; only the access path differs.

Does Imagen 3 prefer keywords or sentences?

Sentences. Imagen 3 has strong natural-language understanding and follows descriptive prose more faithfully than comma-separated keyword lists. Write it the way you would describe the scene to a person.

How do I get photorealistic results?

Combine a photographic style ("cinematic film still", "vintage film photograph") with explicit camera and lighting terms — lens length, aperture, and a lighting condition. Those photographic cues push Imagen 3 toward realism rather than illustration.

Is my prompt sent to Google by this tool?

No. The builder runs in your browser and only assembles text. You copy the prompt and use it in your own ImageFX or API session.

Google Imagen 3 Prompt Builder

Google Imagen 3 prompt builder

Imagen 3 is Google’s high-fidelity text-to-image model, available through the free ImageFX playground and the Vertex AI / Gemini API. Its standout trait is strong natural-language understanding: it follows detailed, sentence-form descriptions closely, so the more precisely you describe a scene, the closer the output lands. This builder turns a few structured fields into exactly that kind of prompt.

How it works

The tool composes a descriptive sentence in a photography-friendly order: style, then subject, environment, lighting, and camera specification, closing with a sharpness cue. Because Imagen 3 reads prose rather than parameters, the output is a flowing sentence — not a keyword stack. Photographic terms do the heavy lifting: a lens length and aperture nudge the model toward realistic depth of field, while a lighting condition sets mood and time of day.

Tips for stronger results

Be concrete about the subject. “A snow leopard mid-stride on wet rock” outperforms “an animal in nature” by a wide margin.
Use real camera language. “85mm portrait lens, f/1.8” and “wide-angle 24mm” give Imagen 3 a clear optical target.
Match lighting to intent. Golden hour reads warm and cinematic; overcast diffuse light flattens contrast for product-style clarity.
Pick one style. Mixing “photorealistic” with “watercolor” confuses the model — choose the dominant medium and let the other cues support it.