YouTube Thumbnail Size Checker
Validate your thumbnail dimensions and preview how it looks across every YouTube layout — all in your browser.
Drop your thumbnail here or click to browse
JPEG, PNG, or WebP — Max 10 MB
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YouTube recommends 1280x720 pixels with a 16:9 aspect ratio. The minimum width is 640 pixels. Files should be under 2 MB for optimal loading, and YouTube accepts JPEG, PNG, and WebP formats.
YouTube will crop or letterbox your thumbnail to fit the 16:9 frame. This can cut off important parts of your image or add black bars, reducing its visual impact in search results and recommendations.
No. Everything happens in your browser. Your image never leaves your device — there are no server uploads, no data collection, and no storage. The tool runs entirely client-side.
While YouTube accepts files up to 2 MB, smaller files load faster in search results and recommendations. Faster-loading thumbnails can improve click-through rates, especially on mobile connections.
HEIC and BMP formats are not supported by YouTube for thumbnails. Convert your image to JPEG, PNG, or WebP before uploading. Most image editors and online converters can do this for free.
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