YouTube Thumbnail Checklist

Fifteen questions to ask about every thumbnail before you hit publish. Tick what's true, and the checklist scores your thumbnail and tells you what to fix first. Your answers are saved in your browser.

1. The idea

I can say what the thumbnail promises in one short sentence.

If the idea needs a paragraph, the thumbnail will be confusing at a glance. Simplify to one promise.

The thumbnail and title add to each other instead of repeating.

Let the image show and the title tell. Repeating the title in the image wastes space.

The video delivers what the thumbnail shows — early.

Misleading thumbnails cause early drop-off and can violate YouTube's policies.

2. Readability at small size

The main subject is recognizable at 168 pixels wide.

That's roughly the size in the desktop "Up next" column. Check it in the feed preview.

There are no more than three main elements.

For example a face, an object and a few words. Every extra element competes for attention.

Any text is four words or fewer and readable on a phone.

Heavy sans-serif font, large, with a stroke, shadow or block behind it. See the typography guide.

Nothing important is in the bottom-right corner.

The video-length badge covers it.

3. Contrast and color

The subject still stands out in black and white.

The grayscale test catches most contrast problems. The Thumbnail Analyzer shows it automatically.

It works on both white and near-black backgrounds.

Light mode and dark mode. Watch for edges that disappear.

There's one dominant color and at most one strong accent.

Too many competing colors make the image harder to read. See the color guide.

4. Emotion and story

If there's a face, it's large and the expression matches the video.

No face? Tick this if the subject itself carries the emotion or tension. See faces in thumbnails.

There's a reason to be curious — a question, a contrast or a result.

Curiosity that the video pays off, not a bait-and-switch.

5. Technical and context

It's 16:9, at least 1280×720, JPG or PNG, under the upload limit.

Limits: 50 MB from a computer, 2 MB from the mobile app. See the size guide.

It looks different from the top results for this topic.

Search your topic and compare. Blending in makes you invisible.

It fits my channel's style but isn't a copy of my last thumbnail.

Consistent enough to be recognized, different enough to be noticed as new.

How the score works

Each item has a weight from 1 to 3 based on how much it usually affects a thumbnail's clarity and honesty. The items that matter most — a single clear idea, readability at small size, contrast in grayscale, and a video that delivers on the promise — count three times as much as small technical details. The score is simply the weighted share of items you've ticked.

It's a self-review, not a prediction. A thumbnail that scores 100% can still underperform if the topic isn't interesting to your audience, and the only reliable measure of performance is real viewers. Once your thumbnail passes the checklist, compare variants with YouTube's Test & Compare.

Using the checklist in your workflow

Design two or three options rather than one. It's easier to judge thumbnails side by side.
Run the measurable checks with the Thumbnail Analyzer (contrast, clutter, edges, specs).
Go through this checklist for the judgment calls software can't make.
Preview the best options in context with the feed preview.
Publish and test the top two with Test & Compare.

For the reasoning behind each point, read our complete thumbnail guide and the list of common thumbnail mistakes.

Frequently asked questions

Is my checklist saved?

Yes, in your browser's local storage on this device, so you can come back to it. Press Reset to start a new thumbnail. Nothing is sent to us.

What score should I aim for?

80% or more means the fundamentals are covered. Below 50%, focus on the "fix these first" list — usually the idea, small-size readability or contrast.

Can I use it for Shorts?

Most points apply, but Shorts are vertical (9:16) and are mostly seen in the Shorts feed, where the opening frame matters more than the thumbnail.