Free Online Thumbnail Text Checker
Use this checker before publishing YouTube thumbnails, reel covers, social graphics, or ad creative. It scores the actual text, shows a quick safe-zone preview, and gives practical notes for mobile readability.
Thumbnail Text Checker
Check YouTube and social thumbnail text for length, readability, contrast planning, mobile scanability, and safe-zone fit.
The dashed box approximates a conservative safe zone. Keep important words inside it for mobile feeds.
Enter thumbnail text or load the sample to begin.