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YouTube Thumbnail Size Checker

Check if your image is valid as a YouTube thumbnail.

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Drop a thumbnail image here or click to browse

The image stays in your browser - only its dimensions and size are read.

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What Is YouTube Thumbnail Checker?

The YouTube Thumbnail Size Checker reports four things about a thumbnail: whether the resolution is at least 1280x720, whether the aspect ratio is really 16:9, whether the file is under 2 MB, and whether the format is accepted. A preview renders it at true 16:9 proportions with a note about any cropping, so you can spot a problem before uploading. If it needs fixing, one button resizes it to exactly 1280x720.

Who Uses the YouTube Thumbnail Checker?

YouTubers, video editors and channel managers use it to make sure a thumbnail is not rejected or deprioritised in search because of its size, shape or file weight.

How to Use the YouTube Thumbnail Checker

  1. Drop your thumbnail image onto the checker panel.
  2. Read the pass and fail results for resolution of 1280x720 or bigger, a 16:9 aspect ratio, the 2 MB file size limit and the accepted JPG, PNG and GIF formats.
  3. Check the 16:9 preview and the crop note, then press the download button to get a version resized to 1280x720.

Why Choose Our YouTube Thumbnail Checker?

  • Four checks in a single report: resolution, aspect ratio, file weight and format
  • Aspect ratio is verified separately, since a wrongly shaped thumbnail is letterboxed by YouTube
  • Download button rescales and centre-crops to exactly 1280x720 with no stretching
  • Runs in your browser, so an unpublished video thumbnail is never uploaded

Try the YouTube Thumbnail Checker above — it is free, fast, and works on any device. Bookmark this page to return whenever you need it.