Size and ratio
Default export size is 1280 x 720 px with a target ratio of 16:9.
YouTube tool
YouTube Thumbnail Checker
Check whether a custom thumbnail meets YouTube's recommended dimensions, 16:9 aspect ratio, accepted formats, and 2MB video thumbnail limit.
Platform target1280 x 720 px
Recommended formatJPEG
File limit2MB
Supported formatsJPEG, PNG, GIF
Compliance
Compliance results
Upload an image to see dimension, aspect ratio, format, and file size checks.
- ResolutionRecommended 1280 x 720 px with a minimum width of 640 px.
Waiting for an uploaded image. - Aspect ratioRecommended 16:9.
Waiting for an uploaded image. - FormatJPG, GIF, or PNG.
Waiting for an uploaded image. - File sizeCustom video thumbnails should be under 2MB.
Waiting for an uploaded image.
Preview
YouTube player and recommendation preview
12:48
Export
Crop, compress, and export
Spec Registry
YouTube Thumbnail image requirements summary
The tool automatically checks what can be verified from pixels and file metadata. Content rules such as white backgrounds, watermarks, and non-included accessories are marked for manual review.
Format and file size
Supported formats: JPEG, PNG, GIF. File size limit: 2MB.
Privacy model
Preview uses browser canvas. Export uses server-side sharp, but it reads only the multipart request buffer and does not persist original uploads.
FAQ
- What is the best YouTube thumbnail size?
YouTube recommends 1280 x 720 px custom thumbnails with a minimum width of 640 px and a 16:9 aspect ratio. - Can I upload a PNG YouTube thumbnail?
Yes. YouTube supports JPG, GIF, and PNG. For photo-based thumbnails, JPEG is often easier to keep under 2MB. - Why does a YouTube thumbnail need a 16:9 ratio?
Most YouTube surfaces display video thumbnails in a 16:9 frame, so matching that ratio reduces unexpected cropping. - Will this tool upload my YouTube thumbnail?
No. The preview runs in the browser, and export processing uses only the request buffer without persisting the original upload. - Which export format should I use for a YouTube thumbnail?
JPEG is usually the best choice for photo-based thumbnails because it keeps file size low while preserving visual quality.
Spec sources
Export guidance
JPEG is usually best for photographic product images. PNG is useful for transparent or graphic assets. WebP can be efficient for storefront performance, but use JPEG or PNG when the target marketplace does not accept WebP.