Thumbfa.st is an AI-powered thumbnail generator for YouTube creators that uses models like Google’s Gemini and OpenAI to keep your uploaded face consistent across designs, copy the style and composition of any inspiration thumbnail via a pasted YouTube URL, and produce 1–4 ready-to-upload 1280x720 variations in under a minute for fast A/B testing; creators use it to save hours on design, maintain brand-recognition, iterate quickly, and bypass generation blocks with built-in pixelation tools, with free starter credits and paid plans for higher-volume use.