Iterate your way to the thumbnail that wins
FatThumb generates up to four thumbnail variations in one pass. Compare them, star the winner, and refine with a new prompt — your full generation history is always saved.
How it works
Three steps from zero to upload-ready.
Generate 1–4 variations in one pass
Each generation produces up to four thumbnail variations from the same prompt. See the creative range before committing to one direction.
Compare and star the best
View all variations side by side. Star the ones worth keeping — they are saved permanently to your version history for this prompt.
Refine with a new prompt and regenerate
Not quite right? Adjust your prompt, swap an Inspiration reference, or change the variation count and generate a new batch. The previous starred variations stay safe.
Features
Everything you need for the click.
Four directions, one generation
Generate 1–4 variations per prompt in a single pass. Each varies in composition detail, expression, and background treatment — same base prompt, genuine range.
Compare all variations together
See all variations from a generation batch displayed together so you can make a direct comparison rather than toggling between separate views.
Every generation saved
FatThumb auto-saves every generation batch to your prompt history. Go back to any previous direction without regenerating from scratch.
Mark the keeper
Star any variation to flag it as a candidate. Starred variations are surfaced first in your history so the best options are always one click away.
Iterate without losing your history
Adjust your prompt and regenerate as many times as you want. Previous starred batches remain in history — nothing is overwritten unless you delete it.
1280×720 PNG ready for YouTube Studio
Every finalized variation downloads as an exact-spec 1280×720 PNG. No cropping, no retouching — drop it straight into YouTube Studio.
FAQ
Questions & answers
How many thumbnail variations can I generate at once?
Free workspaces generate up to 2 variations per prompt. Pro, Ultra, and Lifetime plans unlock up to 4. You choose how many you want: one if you have a clear vision, more if you want to explore the creative range and compare options before deciding.
What does the version history save?
Version history saves every generation batch for a given prompt — all variations, their generation settings (model, Person profile, Inspiration reference), and any starred flags. You can return to any previous batch at any time.
Can I go back to an older generation?
Yes. Your generation history persists so you can review and download any previous batch. Starred variations are flagged so the best ones surface first without scrolling through the full history.
What is the right workflow for iterating on a thumbnail?
Generate 1–4 variations, star any you want to keep, then refine your prompt and generate again. Repeat until you have a winner. The starred history from each batch stays safe so you always have a fallback if the next iteration misses.
Can I compare variations from different generation batches?
Version history shows each batch individually. To compare across batches open your starred variations — they surface your best picks across all batches for a given prompt in one view.
Does iterating cost extra credits?
Each generation batch (1–4 variations) uses credits according to your plan's per-thumbnail rate. Viewing, starring, or downloading from version history does not use additional credits.
See all your options before you commit to one
Generate your first 5 thumbnails free — no card, no designer, your face consistent from the first run.