ThumbBlitz
Free browser-based Roblox thumbnail maker from your screenshots
About ThumbBlitz
ThumbBlitz is a free thumbnail editor for Roblox creators who want a publishable cover from gameplay they have already captured. Users drop in their own screenshot, type a headline, choose a text style and backdrop, add stickers, and export at 1920×1080, the Roblox game thumbnail size. Other export sizes include 1280×720 for YouTube and 512×512 for game icons.
The tool runs entirely in the browser, so screenshots stay on the user's device and are not uploaded to a server. There is no sign-up, no watermark and no AI generation, so the cover shows the actual game rather than an invented scene. It suits creators who need to refresh an old thumbnail or keep a consistent title style across several games.
The site also offers dedicated pages for game icons, MM2, obby and other Roblox genres, plus a size guide and a short tutorial.
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