Thumbnail Score

A quick, honest check of your thumbnail image. This tool measures brightness, contrast, color variety, sharpness, and size in your browser. It does not predict clicks or views, and it does not use AI. Your image never leaves this page.

Choose a thumbnail image

Or drop an image here

Check my thumbnail

How to use it

1. Upload the thumbnail you plan to publish.
2. Click “Check my thumbnail.”
3. Read each bar, fix the weakest one, and re-check.

Want to build a stronger thumbnail first? Try the Thumbnail Generator, then bring the PNG back here. Read the full guide: How to check a thumbnail before you publish.

Limit: this check cannot judge your title wording, face, or topic appeal. A high score here does not guarantee clicks.