YouTube Thumbnail Maker (AI)
Generate click-worthy thumbnail concepts fast, then refine them on a clean canvas and export YouTube-ready 16:9 thumbnails.
Try Stumbnail FreeWant to validate your design first? Use the free YouTube Thumbnail Previewer.
Generate with AI
Start from a prompt or a concept and get thumbnail directions quickly — great for brainstorming multiple angles.
Edit on a canvas
Refine text, layout, and composition without fighting templates. Iterate like a creator, not a designer.
Export YouTube-ready
Designed for true 16:9 thumbnails so your final export is ready to upload to YouTube.
How this AI thumbnail maker works
- 1
Pick a workflow
Prompt, Smart Merge, or start from a YouTube link.
- 2
Generate variations
Create a few strong options with different hooks and styles.
- 3
Polish + export
Adjust text and layout, then export a YouTube-ready 16:9 thumbnail.
YouTube Thumbnail Maker FAQs
What is a YouTube thumbnail maker?
A YouTube thumbnail maker is a tool used to design the image viewers see before clicking a video. A good thumbnail maker helps you create a clear, high-contrast design that is readable on mobile and matches your title.
Can I use Stumbnail as an AI YouTube thumbnail maker?
Yes. Stumbnail generates thumbnail concepts with AI and lets you refine them on a canvas so you can adjust text, layout, and style without starting over.
What is the best YouTube thumbnail size?
The recommended YouTube thumbnail size is 1280×720 pixels with a 16:9 aspect ratio. Stumbnail is built around true 16:9 exports so your thumbnails are YouTube-ready.
Do I need design skills to make a good thumbnail?
No. You still need a clear idea and a strong hook, but Stumbnail is designed to help you get to a solid thumbnail faster with AI generation plus simple editing.