Thumbnail Sketcher is a Generative Pre-training Transformer (GPT) that specializes in generating thumbnail designs for blogs. Whether a user runs a food blog, a tech outlet, or a travel diary, this GPT can facilitate the generation of suitable thumbnails for diverse blog topics. It can also create thumbnail suggestions for do-it-yourself (DIY) project blogs. Users will begin by inputting prompt starters like 'Design a food blog thumbnail,' 'Create a tech blog image,' 'Make a travel blog thumbnail,' or 'Generate a DIY project thumbnail.' Utilizing the base capabilities of the suitably equipped ChatGPT, Thumbnail Sketcher then proceeds to generate a thumbnail that correlates with the inputted directive. It serves as an effective tool for bloggers, content creators, and social media managers looking to give their articles an attention-grabbing visual presence while saving on the time and resources it would take to design thumbnails manually. To access Thumbnail Sketcher, one would need to sign up for the application through the provided platform.