Video creators

YouTube Thumbnail Size Checker

Check whether a thumbnail matches the common 1280 x 720 pixel size, 16:9 ratio and practical file size targets.

Free browser tool

Upload a thumbnail image and get a PublishReady score, warnings and export options for YouTube-style thumbnails.

Drop your image here or choose a file

Supports JPG, PNG, WebP, static GIF and basic SVG. Recommended visual limit: up to 15 MB.

Privacy-first: your image is analyzed locally in your browser.

Publishing preset

Scores are estimated from common platform guidelines and practical publishing heuristics.

Choose a preset, upload an image and the results will appear here with score, warnings, practical recommendations and export tools.

Check dimensions

The YouTube preset checks for a 1280 x 720 target and warns when the image is too small for a crisp thumbnail.

The 16:9 ratio is important because mismatched images may be cropped or boxed in ways that reduce impact.

The tool flags oversized files and offers browser-based export options to create a lighter version.

FAQ

What size should a YouTube thumbnail be?

A commonly used YouTube thumbnail size is 1280 x 720 pixels with a 16:9 aspect ratio.

Does this check thumbnail text readability?

No. It provides a general reminder about safe areas, but it does not read or evaluate text inside the image.

What file size is recommended?

The preset uses a practical target below 2 MB and warns when the file is heavier.

Can I resize my thumbnail here?

Yes. Upload the image, use the resize panel and export a 1280 x 720 version when the browser supports it.