reelbaseYouTube Thumbnail Size
YouTube's official custom thumbnail size is 1280 × 720 pixels (16:9). Resize an image to that size in your browser — free, no signup, and your file never leaves this page.
These are YouTube's published custom-thumbnail requirements, last reviewed August 2026. This page does not treat unofficial sizes as official.
Recommended size
1280 × 720 px
Aspect ratio
16:9
Minimum width
640 px
Max file size
2 MB
Accepted formats
JPG, PNG, GIF, BMP
Last reviewed
August 2026
Keep text and faces in the center ~80% of the frame. YouTube's player UI can cover corners with timestamps and watch-later controls.
Drop an image to cover-fit it into YouTube's official thumbnail size. Nothing is uploaded.
Export format
Dashed box is the center safe zone. Keep titles and faces inside it.
How to resize a YouTube thumbnail
Three steps, all on your device. This is a size guide and resizer — not a thumbnail generator.
Upload an image
Drop a JPG, PNG, GIF, or BMP onto the tool. The file stays in your browser and is never uploaded to a server.
Preview the 16:9 crop
The tool cover-fits your image into YouTube's official 1280×720 thumbnail size and shows a center safe zone for text and faces.
Download the thumbnail
Export a JPG or PNG named youtube-thumbnail-1280x720. If the file would exceed 2 MB, JPEG quality is stepped down automatically.
Thumbnail tips that stay inside YouTube's rules
Use 1280×720, not a guess
Sites sometimes list extra sizes. YouTube's recommended custom thumbnail is 1280×720. That is the only target this tool exports.
Stay under 2 MB
JPG is usually the safer export for photos. PNG can exceed 2 MB even at 1280×720. YouTube will reject oversized files.
Protect the center 80%
Duration stamps and hover controls sit on the corners. Put the title and face where the dashed safe zone is.
Your image never leaves the browser
There is no upload, no account, and no credit cost. The canvas resize runs locally, then you download the file.
Frequently Asked Questions
Official YouTube thumbnail size, file limits, and how this resizer works
YouTube's recommended custom thumbnail size is 1280 × 720 pixels. That is the official size this tool uses. A minimum width of 640 pixels is also required. Specs last reviewed August 2026.
YouTube thumbnails use a 16:9 aspect ratio. 1280 × 720 is exactly 16:9. Images in other ratios are center-cropped to 16:9 so they are not letterboxed on YouTube.
YouTube limits custom thumbnails to 2 MB. This tool warns you if the export would exceed that limit and steps JPEG quality down until the file is under 2 MB when possible.
Keep important text and faces in the center about 80% of the frame. YouTube's player UI can cover corners with timestamps, duration, and watch-later controls.
No. Resizing runs entirely in your browser with canvas. Your image is not uploaded to Reelbase or any other server, and no signup is required.
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