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Free Tool

Thumbnail Text Legibility Checker

Test whether your YouTube thumbnail text is readable at small sizes. Adjust font size, weight, contrast and outline, then check your score with actionable suggestions.

YOUR TEXT HERE
Example Output
12Characters
3Words
85Score
Good Viewing: Small
Suggestions
  • Consider adding an outline for extra clarity, especially on busy backgrounds.

Example: Legibility analysis for a thumbnail with white text on a dark background. Upload your own thumbnail to see your personalised result.

🔍
Type some thumbnail text above to check legibility.
Settings
48px
15%
Text outline / stroke

How to Use

Step 1
Enter your text
Type the text you plan to put on your thumbnail. Adjust font size, weight and background brightness in the settings panel to match your design.
Step 2
Pick a viewing size
Choose Small (mobile), Medium or Large to simulate how viewers will see your thumbnail. Small is the strictest test and the most common viewing context.
Step 3
Read the suggestions
The checker scores your text from 0 to 100 and gives specific suggestions: shorten the text, increase font size, boost contrast, or add an outline.

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