Made for YouTube, not for everything
ThumbMagic works in the 16:9 frame from the first pixel, keeps text clear of the timestamp in the bottom-right corner and exports at YouTube's recommended 1280×720.
AI Thumbnail Generator for YouTube
Describe your video or paste its title. ThumbMagic designs a thumbnail built to be clicked — then lets you refine it by typing.
Try
How the AI thumbnail generator works
- 1
Describe
Paste your video title or describe the idea in your own words.
- 2
Generate
Get thumbnail directions in seconds, in the exact 16:9 frame.
- 3
Refine
Type changes like “bigger text” or “add a red arrow”.
- 4
Export
Download for YouTube, Shorts, X and Instagram in one click.
Why creators use ThumbMagic
Thumbnails that read at phone size
Most views happen on small screens. ThumbMagic favours one strong subject, high contrast and three to five words of lettering, so your idea survives the shrink.
Change anything with a sentence
Instead of layers and masks, you type what you want: bigger text, a different expression, warmer light, a red arrow. Every edit is a new version you can compare.
Variants that make testing easy
Generate several directions for the same video and test the strongest ones with YouTube's built-in thumbnail testing to learn what your audience clicks.
The right size for every platform
One thumbnail, exported in the exact dimensions each platform recommends.
16:9
YouTube thumbnail
1280 × 720
JPG or PNG under 2 MB
16:9
YouTube 4K
3840 × 2160
Sharp on TVs and large displays
9:16
Shorts cover
1080 × 1920
16:9
X post
1600 × 900
4:5
Instagram portrait
1080 × 1350
1:1
Square post
1080 × 1080
1.91:1
LinkedIn post
1200 × 627
1:1
Podcast cover
3000 × 3000
Spotify and Apple Podcasts
Templates by niche
I survived100 days
Hardcore24:13Gaming
Neon light, big moments and bold lettering for gameplay, challenges and let's plays.
Use this templateThe phonenobodytalks about
14:52Tech review
Clean product shots with rim light and minimal type for reviews and unboxings.
Use this template$0 → $10Kin 30 days
Real numbers18:40Finance
Trustworthy charts, numbers and gold accents for money and investing channels.
Use this template