Free thumbnail checker
Will your thumbnail get seen?
Most people see your thumbnail about the size of a stick of gum on their phone. Drop it in and see it that small, get a score, and get specific fixes. Free, no signup, nothing saved.
In a phone feed
Your score
0out of 100
On a desktop home page
What to fix
Want three built from your video?
Thumbnl pulls the best frame from your own video and builds three thumbnails in 16:9 and 9:16, colored to match your footage. Your first one is free.
Make mine from my videoHow it scores: a clear subject at least a third of the frame, a visible face with one expression, the subject separating from the background, not too busy, and enough contrast to pop when shrunk. It can't read your text, so keep words to three or four, big. YouTube thumbnails are 1280x720 (16:9); Shorts thumbnails are 1080x1920 (9:16).