# 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.


## 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.