AI Thumbnail Maker for Reaction & Commentary Videos
Create bold reaction and commentary thumbnails with AI: a big expression, a clear subject and a hook — without copying anyone else's video frames. Describe your video and get a clickable thumbnail.
What makes a reaction & commentary thumbnail get clicked
- 1
Your reaction, huge
The expression is the hook. Make your face large, sharp and expressive, ideally on one side of the frame.
- 2
Show the topic without copying it
Use an original visual or symbol for what you react to (a phone with a viral post, a stage, a product) instead of a screenshot of another creator's video.
- 3
Opinion in the text
Commentary is clicked for a take: “I WAS WRONG”, “THIS IS BAD”, “THEY LIED?”.
- 4
High contrast
Reaction feeds are crowded; a bright accent colour and a clean background help you stand out.
- 5
Fair and safe
Avoid real people's faces you do not have rights to and misleading claims — they can get thumbnails removed.
Prompts you can use right now
Click a prompt to open it in the ThumbMagic studio. Your first thumbnail is free.
- Shocked creator holding a phone showing a glowing viral post with a red warning icon, dark background, text “THIS IS BAD”
- Laughing creator next to a giant stage spotlight and an empty microphone, purple light, text “I WAS WRONG”
- Skeptical creator with raised eyebrow next to a floating product box with a question mark, text “THEY LIED?”
Avoid these
- Screenshots of other creators' videos
- Real people's faces without rights
- Misleading claims
- Small faces in busy collages
Best ThumbMagic settings
- Style
- Bold or Neon
- Quality
- High
- Text on the thumbnail
- A 2–4 word opinion
- Format
- YouTube 16:9 (exports up to 3840×2160) + 9:16 Shorts cover