I built an AI thumbnail generator because I was tired of spending 45 minutes on one YouTube thumbnail
I kept seeing creators spend more time making thumbnails than editing the actual video.
So I built Miniagen — an AI tool that turns a YouTube idea, video link, or existing thumbnail into multiple thumbnail variations for YouTube, Shorts, and Reels.
The idea is simple:
Most creators don’t need “more AI images.”
They need faster thumbnail decisions.
A good thumbnail is usually not the first one. It’s the 5th, 10th, or 20th variation after testing different:
hooks
facial expressions
contrast
background ideas
title framing
emotional angle
Miniagen tries to compress that process into a few minutes.
What I’m testing now:
URL → thumbnail variations
Prompt → thumbnail concepts
Existing thumbnail → better versions
Export-ready visuals for creators/agencies
A workflow that feels more like “CTR brainstorming” than image generation
The hardest part so far hasn’t been generating nice images.
It’s generating thumbnails that look clickable, not just pretty.
Would love feedback from other indie hackers:
Would you position this as an AI design tool, a creator growth tool, or a CTR optimization tool?
