The AI YouTube thumbnail generator built for creators who publish
Describe the thumbnail you want, add your Person profile to lock in your face, and receive 1–4 variations at the exact 1280×720 size YouTube Studio expects — in under 60 seconds.
How it works
Three steps from zero to upload-ready.
Create a Person profile
Upload 1–5 photos of your face. FatThumb validates them and keeps your exact likeness available for every future generation.
Write your thumbnail prompt
Describe the shot: the expression, the background, any supporting objects or text overlay. The more specific the description, the closer the output to your vision.
Generate and download
Pick 1–4 variations, wait under 60 seconds, and download the winner as a 1280×720 PNG ready to upload in YouTube Studio without any editing.
Features
Everything you need for the click.
Your face, every thumbnail
Person profiles keep your exact likeness stable across every video — no random faces, no manual retouching.
Under 60 seconds, start to finish
From prompt to download in under a minute. Write the description, generate, star the winner, done.
Exact 1280×720 PNG
Every generation outputs the exact YouTube thumbnail dimension. Drop it straight into YouTube Studio with no cropping or resizing.
Test 1–4 variations per batch
Generate multiple variations in one pass and compare them before committing. Pick the option most likely to win the click.
Reference any winning thumbnail
Paste a YouTube URL to extract a thumbnail's style, colours, and composition and use it as a creative reference in your prompt.
16 viral-format starting points
Start from a proven composition pattern instead of a blank canvas. Templates cover the click mechanics that work across YouTube niches.
FAQ
Questions & answers
What makes FatThumb different from other thumbnail tools?
The key differentiator is face consistency via Person profiles. Most AI thumbnail generators drift the face between runs. FatThumb places your face reference at the highest-weight position in the generation engine so you stay recognisable every time.
What resolution does FatThumb output?
Every generation is 1280×720 pixels — the exact YouTube-recommended thumbnail resolution. No cropping or resizing required before uploading to YouTube Studio.
How many thumbnails can I generate for free?
The free plan includes 5 thumbnails with no credit card required. Generated thumbnails on the free plan include a small watermark. Paid plans start at $20/mo for 150 thumbnails a month.
Can I use my own AI API keys?
Yes. The Lifetime plan lets you connect your own Gemini and OpenAI keys. You generate on your own quota at near-zero marginal cost — useful for channels publishing daily.
How do I keep my thumbnail style consistent across a series?
Use the same Person profile combined with the same template or Inspiration reference across every video in a series. The face stays the same; the composition pattern stays the same; only the specific shot details change.
Does FatThumb work for channels with multiple presenters?
Yes. Create a separate Person profile for each presenter and switch between them at generation time. The workspace supports multiple profiles so you can serve multi-host channels or agency clients without mixing face references.
Start generating YouTube thumbnails with your face locked in
Generate your first 5 thumbnails free — no card, no designer, your face consistent from the first run.