YouTube Thumbnail Size Checker
Check the pixel dimensions of a thumbnail image before preparing an upload. The dimensions view is selected and uses the actual file header, not an invented suitability score.
Preparing your workspace…
Read the actual source pixel dimensions
The size panel reads encoded image-header dimensions and reports width, height and ratio. A 16:9 canvas can suit a widescreen composition, but displayed orientation and the destination's current upload rules must also be checked. Pixel dimensions do not establish file size, image quality or upload eligibility.
Use the preview as an editing check
Choose a local JPG, PNG or static WebP image, inspect the selected view and compare it with another layout using the view control. If the subject or title is hard to read, revise the original artwork and upload the new version. The preview does not modify or download a redesigned thumbnail.
What the preview cannot predict
No analytics, audience preference, ranking or CTR model runs here. YouTube may display thumbnails differently by context, device and product update. Use real published-video analytics to evaluate performance, and keep an original image at sufficient quality. The selected file stays in the browser.
Common questions
Does this predict clicks?
No. It is a visual editing aid using your image and simulated layouts, with no click-through-rate or search-position prediction.
Can I resize the source here?
This tool previews and checks the source. Open Image Resizer if you need a new pixel canvas.