# AI Thumbnail Generator

> Kenerate's AI thumbnail generator makes 16:9 video thumbnails with big, readable text from a description. The Thumbnail preset generates four variants per click so you can pick the one that reads best on a phone. GPT Image 2 (16:9 up to 4K) was the most reliable with text in our tests; Qwen Image 3.0 (free plan) also handles text. A free account gets 25 credits.

URL: https://kenerateai.com/ai-thumbnail-generator
Publisher: Kenerate AI (https://kenerateai.com)
Last updated: 27 September 2026

## Key facts
- Shape: 16:9
- Preset: 4 variants per click
- Best text: GPT Image 2
- Free start: 25 credits

## Steps
1. Pick the Thumbnail preset — In /app/image choose Thumbnail — 16:9, four variants per click.
2. Pick a model — GPT Image 2 for the most reliable text; Grok Imagine Image for image-only drafts.
3. Write the thumbnail — Subject, emotion, and the exact words in quotes.
4. Choose and download — Pick the best of four and download without a watermark.

## In depth

### Design for a phone screen
Most thumbnails are seen at the size of a thumbnail — a few centimetres across on a phone. Anything that isn't big, bright and simple disappears. That's why good thumbnails use one subject, few words and strong contrast.

### Test variants, not just prompts
Because the preset makes four variants at once, you can compare framing and text placement side by side. Pick the one that still reads when you shrink it, and keep its prompt and seed for the next video to build a consistent channel look.

## FAQ
Q: What is an AI thumbnail generator?
A: A tool that makes video thumbnails from a description — the right 16:9 shape, a clear subject and bold text.

Q: Can AI write the text on my thumbnail?
A: Yes. Put the words in quotes. GPT Image 2 was the most reliable in our tests; keep it to three to five words.

Q: Is the AI thumbnail generator free?
A: A new account gets 25 free credits on sign-up to test, and Qwen Image 3.0 is on the free plan. Bigger jobs use one-time credit packs that never expire — no subscription.

Q: Can I put my own face on the thumbnail?
A: Yes — upload your photo as a reference to GPT Image 2 or Seedream 5.0 Pro and describe the scene. Only use your own photo or one you have permission to use.

Q: What size is a YouTube thumbnail?
A: 16:9 — 1280×720 is the usual minimum. The Thumbnail preset generates at 16:9.

## Related pages
- AI poster generator: https://kenerateai.com/ai-poster-generator
- AI sticker generator: https://kenerateai.com/ai-sticker-generator
- GPT Image 2: https://kenerateai.com/model/gpt-image-2
- AI image editor: https://kenerateai.com/ai-image-editor

## Sources