The free AI YouTube thumbnail analyzer and tester. Get an instant 0-100 score, a brutally honest roast, and specific fixes. Stop guessing. Start roasting.
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Step 1
Drop in any YouTube thumbnail — JPG, PNG, or WEBP — and optionally add your video title for sharper, more relevant feedback.
Step 2
Our AI thumbnail analyzer examines visual hierarchy, text readability, and clickability the same way a scrolling viewer would, in about half a second.
Step 3
Receive an instant score out of 100, a full breakdown of what's working and what isn't, and specific fixes — free, no signup required.
Your thumbnail is the single biggest lever on whether a video gets clicked at all — no matter how good the video itself is. ThumbRoasty breaks that judgment down into three concrete, checkable factors instead of a vague gut feeling. Not sure what counts as a good number in the first place? See real CTR benchmarks.
Does your thumbnail have one clear focal point, or is everything competing for attention at once?
Would your thumbnail text actually read at the tiny size it renders in a mobile feed?
Does it create genuine curiosity, or is it generic clickbait viewers have learned to scroll past?
Whether you call it a thumbnail tester, a thumbnail rating, or a thumbnail check, the goal is the same: find out what's wrong before you publish. Making thumbnails for a series? Score each episode and see how to keep a thumbnail series consistent.
A live A/B test needs a published video and days of impressions before it tells you anything. Run a quick thumbnail test here first and only publish the version that holds up.
Get a clear 0–100 thumbnail rating plus a breakdown by visual hierarchy, readability, and clickability, so you know exactly which part is dragging the score down.
Catch low contrast, cluttered composition, and text that turns to mush on a phone before viewers do. Also worth confirming: export at the right dimensions.
A thumbnail that looks great zoomed in on your monitor can fall apart at real feed size. Preview it in a desktop feed, a mobile feed, and Up Next, plus a grayscale contrast check.
Upload it to ThumbRoasty's free thumbnail tester. In a few seconds you get a 0-100 score, a roast of what's weak, and specific fixes, so you can improve the thumbnail before the video goes live instead of waiting on impressions data.
No. A thumbnail tester like ThumbRoasty analyzes the design itself and gives feedback instantly, before you publish. An A/B test compares how two versions perform with real viewers after the video is live and takes days to collect enough data. They work well together: fix the obvious problems first, then A/B test the versions that are left.
It looks at the real pixels in your uploaded image — colors, composition, text placement, and subject — and scores it across visual hierarchy, readability, and clickability, the same factors that drive real YouTube click-through rate.
Yes. You get 5 free AI roasts per day with no account, no credit card, and no watermark restrictions on the downloadable result.
The AI evaluates your thumbnail against the same design principles that separate high-performing thumbnails from ones viewers scroll past, then converts that analysis into a 0-100 score with specific, actionable suggestions.
Think of it as a fast, brutally honest first opinion — great for catching obvious issues (poor contrast, cluttered composition, unreadable text) before you publish, not a replacement for a professional designer's eye.
No. Your image is sent to our AI provider to generate the roast and returned to your browser — it isn't saved to a database or shared with anyone else.
Canva and similar tools help you design a thumbnail from scratch. ThumbRoasty does the opposite job: it takes a thumbnail you've already made and grades it against the same factors that drive real click-through rate, with specific fixes — a critique tool, not a design tool.