Create eye-catching YouTube video thumbnails formatted to Google's official recommendations: 1280 pixels wide by 720 pixels high, 16:9 ratio, and under 2MB.
Processed client-side in your browser — files never leave your device.
Free, with no signup, account, or usage limits.
Works on any modern browser, including mobile.
About this tool
Resize Image: Resize images to specific dimensions. Processing runs locally in your browser — your input is not uploaded to ThothBox.
How to use
Open Resize Image and add your file (upload or drag and drop).
Set the options that match your goal.
Run the action — processing happens in your browser.
Download or copy the result when it is ready.
FAQ
What is the optimal size for a YouTube thumbnail?
1280x720 pixels with a 16:9 aspect ratio and file size under 2MB in JPG, PNG, or WebP format.