Thumbnail to Prompt
Choose a thumbnail to begin.
🔒 Your files are processed in your browser and are never uploaded.
Thumbnail to Prompt: free online tool
Upload a YouTube thumbnail and this free thumbnail to prompt generator analyses the subject position, colour palette and contrast, then writes an AI image prompt in 16:9 with space for your title text.
How to use the Thumbnail to Prompt tool
- Upload a thumbnail image (JPG, PNG or WebP).
- Optionally type the title text you want on your own thumbnail.
- Click “Generate thumbnail prompt”.
- Paste the prompt into an AI image generator and customise it.
Features
- Detects subject placement and suggests where the text should go
- Dominant colours and contrast level
- Optional custom title text in the prompt
- Private: nothing is uploaded
Frequently asked questions
Can I use this to copy another creator’s thumbnail?
The prompt describes layout, colours and composition for inspiration. Please create your own original artwork and respect other creators’ copyright.
What aspect ratio does the prompt use?
16:9, the standard YouTube thumbnail ratio (recommended size 1280×720).
Does it read the text on the thumbnail?
No. It analyses objects, colours and layout. You can type your own title text and it will be added to the prompt.
Is it free?
Yes, completely free with no sign-up.