Automatically find the sharpest, best-lit, face-visible frame from any video for thumbnails. Browser-side, no upload, no login.
Drop a file or click to choose
mp4 · mov · webm supported
🔒 Your file is processed in your browser. It is not uploaded to any server for this tool.
Upload video
AI picks best frames
Download thumbnail
Instant — No Install
Works directly in your browser. No app download needed.
Private & Secure
Your video never leaves your device for free tools.
No Login Required
Just upload and start editing. No account needed.
No Watermark
Export clean videos without any CutKarlo branding.
Is it free?
Yes, 100% free. No login or upload to server required.
Free, no login, runs in your browser. Just upload and start.
No login · No watermark · No upload to server