# Thumbn — AI thumbnail generator for YouTube, TikTok and Reels

> Thumbn turns a video into click-worthy thumbnails. Paste a YouTube, TikTok or Instagram Reels link — or upload the file — and it watches the footage, finds the most clickable moment, writes the concept, renders every platform size, then scores and re-edits its own work until it clears a quality bar.


## How the thumbnail maker works

Three steps, all visible while they run. Every image it makes is kept.

### It watches the whole video

Scene by scene with timestamps, then picks the single second that would stop a scroll — instead of asking you to describe your own footage.

### It renders every platform size

One concept becomes a 1280×720 YouTube thumbnail and a 1080×1920 image for TikTok and Instagram Reels.

### It grades and redoes its own work

Each render is scored against the style's rubric, then re-edited until it clears the bar. Nothing is overwritten.

## Then you direct it

A generator that stops after one image isn't much use. Click any thumbnail to point the agent at it and say what to change.

### Targeted edits

Point at one image and the agent edits that exact frame, returning a new version rather than overwriting the old one.

### Your face, logo or reference look

Attach reference images so faces, logos and products stay faithful across renders.

### Full version history

Every version is kept, scored and downloadable as a PNG.

### Styles

Switch between MrBeast, clickbait, cinematic, minimal, aesthetic and documentary styles at any time.