Thumbnail StudioWorking today
Thumbnails judged at the size that decides clicks
Most AI thumbnail tools hand you whatever the model produced and let you find the problems yourself. Thumbnail Studio scores every render the way a viewer actually sees it, shrunk to 320 by 180 on a phone, and regenerates the ones that fail before they reach you.
Start from a niche, not a blank prompt
Sixty distinct presets across ten creator genres, each with its own source image, composition recipe and prompt guidance. Pick one, describe the video, and the preset carries that genre's visual grammar into the render instead of reusing one layout with a different caption.
Your face, or a character that stays consistent
Upload one clear headshot and it becomes the identity reference for every render, with instructions strict enough that the result stays recognisably you rather than a generic AI face. Faceless channel? Generate a character once and it recurs across your thumbnails so viewers learn to spot your videos.
A judge that has to be satisfied
Each render is scored against gates, not vibes:
- Legibility: one clear focal subject readable in under a second at feed size
- Text: four words or fewer, spelled correctly, clear of the timestamp corner
- Honesty: no promise the video does not deliver
- Identity: if a face was expected, it still looks like the person
- A failed gate triggers one automatic retry with the judge's own criticism folded in
Text added after, not baked in
The image is generated with no text at all, then the caption goes on top as a layer you control. Eight preset styles cover the treatments that actually work on YouTube, so you pick one and type your hook instead of fiddling with colour pickers. Drag to position, export at exactly 1280 by 720.
One instruction at a time can also be sent back to the model, so "make the background red" changes the background and leaves everything else alone.