|3 min read
Gemini Thumbnail Creator: A Prompt for Instagram Reel Thumbnails
geminiprompt
This is the thumbnail generation prompt I use for my Instagram Reels. It is designed to produce consistent, brand-aligned thumbnails with minimal iteration.
You can find the full prompt here: Gemini Thumbnail Creator Gist
What it does
- •Generates a 9:16 vertical thumbnail
- •Places a clear human subject and brand logo
- •Uses cinematic, high-contrast colors
- •Keeps text large and readable on mobile
- •Maintains a consistent visual system across posts
How to use it
- 1.Copy the prompt from the gist.
- 2.Replace the topic placeholder with your video subject.
- 3.Attach your logo and any reference images.
- 4.Generate in Gemini's image generation mode.
- 5.Pick the strongest result and export.
The goal is speed with consistency. Generate two or three variants, pick the strongest, and move on. Thumbnail work should be a system, not a project.