Shrink it
View the thumbnail at about 168 pixels wide to simulate a phone feed.
THUMBNAIL CHECKER / 01
Check your YouTube thumbnail before it goes live.
A thumbnail has about half a second to make sense in the feed. Use this checker to review focus, contrast, text and mobile readability, then open the analyzer for a detailed review.
For creators who already have a draft and want to find the weak spots before publishing.
TUBNEXA / CHECKER / 0216:9
FOCAL SUBJECTMake one idea large enough to read.
VISUAL PROMISEWOULD YOU CLICK IT?
01UploadYour draft
02ReviewClarity and contrast
03ImproveBefore you publish
WHY THIS WORKFLOW
Most weak thumbnails fail in the same few ways.
They have too many elements, text that is too small, low contrast between subject and background, or an idea that is not clear without the title. A good checker looks at those points in order. Shrink your thumbnail to about the size of a feed card, squint, and ask whether you still understand the subject, the emotion and the promise. If not, simplify before you add anything else.
THE WORKFLOW
From rough premise to a frame worth reviewing.
See the full workflowTest the three-second rule
Ask what the subject, the emotion and the promise are. If any answer is unclear, simplify.
Run the analyzer
Upload the draft to the TubNexa analyzer for a focused review of the visual signals.
KEEP THIS CLOSE
A practical 8-point thumbnail check
Answer yes to each point before you publish.
Open the Analyzer01
One clear focal subject.
02
Three words of text or fewer.
03
Strong contrast between text and background.
04
Faces and emotion are visible at small size.
05
The image supports the title instead of repeating it.
06
Key details are away from the bottom-right timestamp.
07
Colors stand out from a white and a dark feed.
08
It is consistent with the rest of the channel.
QUESTIONS CREATORS ASK
Useful answers before you choose a workflow.
How do I check if my thumbnail is good?
View it at small size, check that you can read the text and see the subject, and compare it with competitor thumbnails in the same feed.
What makes a thumbnail get more clicks?
Clear subject, contrast, minimal text and a promise that matches the title. Results vary by channel and audience.
Does the analyzer guarantee more views?
No tool can guarantee views. It highlights visual issues so you can make a more deliberate decision.
Can I check a thumbnail made in another tool?
Yes. Upload any draft, whether it came from Canva, Photoshop or TubNexa.
READY WHEN THE IDEA IS
Bring the rough version. Leave with a clearer point of view.
No inflated promises. Just a better place to begin.