AI Thumbnail Generator for YouTube

Yes. You can generate one thumbnail without signing in. Sign in with Google to bring your allowance to three generations in total, including your guest generation. Select 1K for free generation in either 16:9 or 9:16. Free downloads retain the generated dimensions and include a Thumbrix watermark; the result shows its actual pixel size. Your allowance is attached to your browser or account, so refreshing the page does not reset it. If a generation fails, the reserved credit is returned. Viewing an example does not use a credit.

The creator pack is a one-time $9 purchase with 20 additional thumbnail generations. It unlocks 2K and 4K generation alongside 1K, plus original downloads without a watermark. Select the size before generating. Older saved images keep their original dimensions; they are not automatically upgraded to 4K. There is no recurring subscription and purchased credits do not expire. Each successful new generation uses one credit; downloading an existing result again does not. 1K uses remaining free generations before purchased credits. 2K and 4K always use one paid credit each.

No. A written description is enough to create a thumbnail. Upload a photo when you want the result to use a particular person, product or object as a visual reference. Use a JPG or PNG under 5 MB, no larger than 4096 pixels on either side and under eight megapixels. A clear, well-lit photo with an uncluttered subject works best. AI may change details, so always review the result before publishing it.

The images labelled as examples are pre-generated illustrations of possible visual directions. They appear immediately so you can see what a thumbnail might look like before entering anything. They are not live results from your description. Your own result appears after you press Generate thumbnail and generation finishes. Example prompts are starting points, and their output will vary between runs.

Allow about two minutes for your thumbnail. Generation starts after you submit your description. The time depends on the image service, queue and complexity of the request, so we do not guarantee a fixed completion time. The preview shows the actual elapsed time while your image is being created. You can refresh or return in the same browser and check the saved task. A request that times out returns its reserved credit so you can try again.

Use the optional Text on thumbnail field to request a headline. A few large words usually work better than a complete video title. The AI creates the image and lettering together, so spelling, placement and small details can vary. Check the output before downloading. To change the scene, colors or headline, edit your inputs and generate a new version. The first version of Thumbrix does not include a layer-based design editor.

A clear thumbnail can help viewers understand a video, but no design guarantees clicks or growth. Results depend on the audience, topic, title and where the video appears. Aim for a truthful visual promise that the video delivers. Compare variations over time using your channel analytics, and change one major element at a time when you want to understand what viewers respond to.

Your description and optional photo are sent to our image generation provider to create the result. The site keeps a local draft in your browser to help you return after signing in or checking out. Generated files are stored with your task and served through access checks. Original files are not included in the public preview response. Only upload material you have permission to use, and read our Privacy Policy for the current processing details.

Closing or cancelling checkout does not remove your saved thumbnail. Return to the generator and continue from the same account. Paid credits and original download access appear after the payment provider confirms the purchase; visiting a success URL alone does not unlock them. Some payments take longer to confirm. Wait for your balance to update before starting another purchase, and keep your payment receipt for any billing questions.