Online YouTube Thumbnail Resizer

Resize and extend your thumbnails instantly. Perfect dimensions, zero hassle.

Resize Your Way to the Perfect First Impression

Go Beyond Borders with the AI Extender

Why Resizing Your Thumbnail Actually Matters

The Ultimate YouTube Thumbnail Size Guide

How to Use the YouTube Thumbnail Resizer

Upload Your Image

Resize or Extend

Preview & Download

YouTube Thumbnail Resizer FAQs

Is YouTube thumbnail 16:9 or 4:3?

Which size is used for YouTube thumbnails?

What do most YouTubers use for thumbnails?

What makes a thumbnail stand out?

How do I resize a picture for a YouTube thumbnail?

Why is my thumbnail not fitting on YouTube?