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Thumbnail Lab

Thumbnails, in 4K.

Describe your video and pick a look. Gemini writes the hook, art-directs each concept and paints the scene; you fine-tune the text and colours, then download a crisp 3840×2160 thumbnail.

Design style
Emotion
Colour palette
Text position
Your photo optional

Every field is optional — Gemini turns whatever you give it into 3 ready-to-download thumbnails, rendered at a true 3840×2160. Free to use; a few runs per visitor every 10 minutes.

How it works

How to use Thumbnail Lab

  1. Describe the video

    Enter the video title or topic — every field is optional, including niche, mood and style.

  2. Pick a concept

    Gemini writes the hook and art-directs three thumbnail concepts.

  3. Fine-tune and download

    Adjust text and colours, then download a crisp 3840×2160 PNG or YouTube-ready JPG.

  • Three thumbnail concepts per video, each with its own hook, palette and layout
  • Rendered at native 4K (3840×2160), 16:9
  • Styles: Modern, Bold & Viral, Minimal, Cinematic, Gaming, Tech, Neon, Retro, Luxury, Cartoon, Educational, Vlog, Documentary
  • Edit headline, colours and layout in the browser; download PNG or YouTube-ready JPG under 2 MB
FAQ

Thumbnail Lab questions

Is Thumbnail Lab free?

Yes, it's free with no sign-up or watermark.

What size are the thumbnails?

3840×2160 pixels (4K, 16:9). YouTube recommends at least 1280×720, so the 4K file stays sharp on every screen; the JPG download is kept under YouTube's 2 MB limit.

What thumbnail styles can I choose?

Modern, Bold & Viral, Minimal, Cinematic, Gaming, Tech, Neon, Retro, Luxury, Cartoon, Educational, Vlog, Documentary.

How does the AI design a thumbnail?

Google Gemini writes a short hook headline, picks a colour palette and layout, and directs the background art; your browser then renders the text and graphics at full 4K resolution.

Can I edit the thumbnail after it's generated?

Yes. You can change the headline, colours and layout before downloading.