Free tool · no signup
Free Thumbnail Tester
See your thumbnail the way viewers actually meet it: in a feed next to competitors, and at the tiny sizes where clicks are really decided. Runs entirely in your browser.
Common questions
Is my image uploaded anywhere?
No — the preview renders entirely in your browser. The file never leaves your device.
What should I look for?
Readability at the smallest size, one clear focal point, and contrast against neighboring thumbnails. If you squint and it turns to mush, so will the click-through.
Can Virafold make thumbnails too?
Yes — signed in, every rendered clip can generate AI thumbnail art with your title burned on.
More free tools: see the whole toolbox — or run the free channel audit.