Free AI Tool
AI Thumbnail Maker
4 Designs
1280 × 720
Download-ready
Frequently asked questions
Is this really free?
Yes. You get one generation per day without an account. Sign up free for unlimited thumbnails across every tool.
What size are the thumbnails?
Every thumbnail is 1280 × 720 pixels — the exact size YouTube recommends, so they stay crisp on desktop and mobile.
Can I use these on my channel?
Yes. The thumbnails you generate are yours to download and use however you like — no credit required.
Can Slenvox make the whole video too?
Yes — that's the main product. Describe a topic and Slenvox generates a complete cinematic video with narration, footage, and music. Try it here.