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AI Thumbnail Generator | AI In Action

ChallengesAI Thumbnail Generator

OfficialBeginnerAI Video Generation

3-5 hours

AI Thumbnail Generator

Build a tool that generates eye-catching video thumbnails using AI image generation. Users upload a video or provide a topic, and the app creates multiple thumbnail options with bold text overlays, contrast-optimized layouts, and platform-specific sizing for YouTube, TikTok, and Instagram.

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canvasimage-generationthumbnailssharp

Objectives

Extract key frames from uploaded videos as thumbnail candidates
Generate AI-enhanced thumbnail images with text overlays
Support multiple aspect ratios for different platforms
Implement a template system with customizable fonts and colors
Add A/B thumbnail comparison and download in multiple formats

Hints

Use ffmpeg.wasm to extract frames from video in the browser
The Canvas API or sharp can composite text onto images
Offer preset templates optimized for YouTube CTR best practices

Resources

github.com/nicolo-ribaudo/ffmpeg.wasm
sharp.pixelplumbing.com

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