YouTube thumbnail checker
Check your YouTube thumbnail before you publish.
Bring an existing thumbnail or review one you created in ThumbFocus. Get AI feedback on readability, contrast, composition and how well the image supports your video title.
Review a thumbnailReviews require paid access and cost 1 credit per image. View plans.
What would you check in this pizza thumbnail?
The lifted slice gives the eye a clear subject. Check whether the background competes with it and whether any headline stays readable on a phone. If the video promises speed, the image or text should make that promise understandable.
Illustrative example, not a measured audience result.
Give the review your video context
Upload the image you plan to publish and provide the relevant video title or idea in the review form. A thumbnail can be visually clear and still communicate the wrong promise for the video.
You can also review generated options from your Library. Each reviewed image costs 1 credit, so reviewing three candidates costs 3 credits in addition to any generation costs.
Read the reasons behind the score
Use the feedback to find a specific next change: simplify a busy background, enlarge the subject, increase contrast or shorten a headline. A number alone cannot explain whether the thumbnail fits your audience.
For the pizza example, compare a wide shot with a tighter crop of the lifted slice. Decide whether the closer view makes the finished food easier to recognize at a small size. This is an illustrative design decision, not a claim of measured improvement.
Improve one thing at a time
Keep your original version and change the most important issue first. Compare the two at the same size with the same video context. This makes it easier to see what your edit actually changed.
A new review may give a similar score even when one detail improves, and AI judgments can vary. Look for a visible improvement and useful reasoning rather than repeatedly generating just to chase a higher number.
Is the score a prediction of clicks?
No. It is an AI assessment of the image and context, not measured click-through rate, audience testing or a guarantee of more views. Topic, title, audience and where a video appears all affect its performance.
Use the review to narrow down your options. Test your final choice with your audience and compare that real-world feedback with the suggestions.
Does every thumbnail need text?
No. Text is useful when it adds a missing piece of context. A clearly recognizable subject can work without it. If you include text, check whether it stays legible when the thumbnail is small and whether it complements the video title.
Can I check a thumbnail made elsewhere?
Yes. Upload an existing thumbnail to the review tool; you do not need to generate it in ThumbFocus first. Reviews use paid credits. The free offer covers one generated thumbnail, not a free review.