AI YouTube Thumbnail Generator
The thumbnail is the click. Use GPT Image 2 for text, layouts, and callouts, then FLUX 2 Max for dramatic faces and scenes. Generate several variants and compare their performance with your publishing workflow.
Best models for this job
Oakgen selects the right model automatically, but knowing which one fits the job helps you write better prompts and get better results.
GPT Image 2
Text and callout rendering inside image layouts
FLUX 2 Max
Photorealistic faces, dramatic lighting, and high-contrast scene composition
Nano Banana Pro
Polished visual output with accurate text and brand-consistent style
Step-by-step workflow
Every step runs in one Oakgen workspace — one credit balance, no tab-switching.
Write a thumbnail brief: video topic, target emotion (curiosity, shock, FOMO), key text overlay
Choose GPT Image 2 for text-heavy layouts or FLUX 2 Max for face-and-scene compositions
Generate 5-10 variants — vary color temperature, text position, and facial expression
Select top candidates and upscale to 1280x720 minimum for YouTube
A/B test using YouTube Studio split-test or schedule the best 2 for sequential testing
Reuse the winning style as a consistent prompt prefix for your channel's visual identity
Frequently asked questions
Which AI model generates the best YouTube thumbnails?
Use GPT Image 2 for text-in-image thumbnails with callouts and title overlays, or FLUX 2 Max for photorealistic faces and scenes. Compare multiple outputs before choosing a final thumbnail.
What resolution should AI YouTube thumbnails be?
YouTube recommends 1280x720 pixels (16:9 aspect ratio). Oakgen generates at high resolution and you can upscale outputs with the Image Upscaler tool to hit YouTube's spec.
Can AI generate thumbnails with actual faces?
Yes. FLUX 2 Max generates photorealistic human faces from text descriptions. For thumbnails showing a specific real person, you'll need to use their likeness rights appropriately — AI-generated lookalikes require caution. For fictional faces, FLUX 2 Max works excellently.
How many thumbnail variants can I generate per month?
The number of thumbnails you can generate depends on the model and settings you choose. Oakgen shows the credit cost before each generation so you can plan your variants.
Will AI-generated thumbnails look generic?
Only if the prompts are generic. Describe your channel's visual style, color palette, emotional tone, and composition preferences in detail. Consistent prompt prefixes make every thumbnail feel on-brand, not stock-like.
One credit balance covers every tool
Credits are shared across image, video, voice, and music generation. Simple images use fewer credits; premium video uses more. The exact cost is shown before generation. Plans start at $9/month.