# Thumbn — AI thumbnail generator for YouTube, TikTok and Reels > Thumbn turns a video into click-worthy thumbnails. Paste a YouTube, TikTok or Instagram Reels link — or upload the file — and it watches the footage, finds the most clickable moment, writes the concept, renders every platform size, then scores and re-edits its own work until it clears a quality bar. Paste a YouTube, TikTok or Instagram Reels link — or upload the file. Thumbn actually watches it, finds the most clickable second, writes the concept and renders the thumbnail at every size you need. ## How the thumbnail maker works Three steps, all visible while they run. Every image it makes is kept. ### It watches the whole video Scene by scene with timestamps, then picks the single second that would stop a scroll — instead of asking you to describe your own footage. ### It renders every platform size One concept becomes a 1280×720 YouTube thumbnail and a 1080×1920 image for TikTok and Instagram Reels. ### It grades and redoes its own work Each render is scored against the style's rubric, then re-edited until it clears the bar. Nothing is overwritten. ## Then you direct it A generator that stops after one image isn't much use. Click any thumbnail to point the agent at it and say what to change. ### Targeted edits Point at one image and the agent edits that exact frame, returning a new version rather than overwriting the old one. ### Your face, logo or reference look Attach reference images so faces, logos and products stay faithful across renders. ### Full version history Every version is kept, scored and downloadable as a PNG. ### Styles Switch between MrBeast, clickbait, cinematic, minimal, aesthetic and documentary styles at any time. ## Pricing Credits cover renders that run on Thumbn's API keys. Bring your own Google, OpenAI or Anthropic key and those renders bill to your provider account instead. Monthly plan credits reset each billing period; credits bought as packs never expire. ### Pro — $19/month 60 credits a month - Both image models - No watermark - 4 concepts per run - Full agent studio ### Studio — $49/month 175 credits a month - Everything in Pro - Highest monthly allowance - Credit packs never expire - Priority rendering ## Frequently asked questions ### What is an AI thumbnail generator? An AI thumbnail generator creates video thumbnails automatically instead of you designing them by hand. Thumbn goes further than a text prompt: it watches your actual video, finds the most clickable moment, writes the concept and renders the image. ### How does Thumbn make a YouTube thumbnail? Upload a video file or paste a link. Thumbn analyses the footage scene by scene, picks the peak moment, writes a thumbnail concept in the style you choose, then renders it at 1280×720 for YouTube and 1080×1920 for TikTok and Reels. ### Can I edit the thumbnail after it is generated? Yes. Click any thumbnail to point the agent at it and describe the change — bigger text, a different background, a red arrow. Every version is kept, so you can always go back to an earlier one. ### Does the thumbnail maker work for TikTok and Instagram Reels? Yes. One run produces both a 16:9 image for YouTube and a 9:16 image for TikTok and Instagram Reels, from the same concept. ### Do I need my own API keys? No. Renders run on Thumbn's keys and spend credits from your plan. If you add your own Google, OpenAI or Anthropic key, those renders bill to your provider account instead and stop using credits. ### How much does Thumbn cost? Pro is $19 a month for 60 credits, and Studio is $49 a month for 175 credits. Monthly credits reset each billing period; credits bought as packs never expire.