The best YouTube thumbnail image size is 1280 x 720 pixels with a minimum width of 640 pixels. This is the recommended size by YouTube for videos.

What is The perfect sizes for YouTube thumbnail image?

Your custom thumbnail image should be as large as possible. YouTube recommend your custom thumbnails:

• Have a resolution of 1280×720 (with minimum width of 640 pixels).
• Image formats : JPG, GIF, or PNG.
• 2MB limit.
• Try to use a 16:9 aspect ratio as it’s the most used in YouTube players and previews.

Use full tips to create high quality thumbnail image?

• Quality images: Channel art is attract people, create high-quality art that will make a good impression.
• Add text: Make sure to use large text that enough to be easily legible.
• Engage people: Describe more to your channel art. What you want people to subscribe to your channel or Watch your latest video? Visit your website?.

How to create high quality thumbnail image for YouTube?

By using this tool, you can create a channel art that will help you grow your YouTube channel.

1. Canva: Canva is a use full tool to create a best channel art that describe your branding. Canva is a free online tool that makes it easy to create professional-looking profile pictures, or social media graphics.
2. Pixlr: Pixlr is another free and use full tool to create professional Looking photo editing for your social media accounts include YouTube logo and channel art, Pixlr X is the next generation photo editor.