YouTube Thumbnail Resizer
Drop in any image and get it back at YouTube's exact thumbnail size — 1280×720, 16:9, compressed under the 2MB limit. Free, no login, nothing uploads.
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YouTube is strict about thumbnails: 1280 × 720 pixels, a 16:9 aspect ratio, under 2MB, as a JPG, PNG or GIF. Miss the file-size limit and the upload is rejected; miss the aspect ratio and YouTube squeezes your artwork between black bars while every competing thumbnail fills its frame. This tool checks your image against the full spec, then fixes whatever fails — and it all happens in your browser, so the image never leaves your device.
What size is a YouTube thumbnail?
The recommended size is 1280 × 720 with a minimum width of 640 pixels. Larger 16:9 images (like 1920 × 1080) are accepted but gain you nothing — YouTube resizes everything down to its own serving sizes anyway, and bigger files are more likely to hit the 2MB cap. We broke down the full spec, and the sizes YouTube actually renders your image at, in the YouTube thumbnail size guide.
How to make an image 16:9 without stretching it
If your source image isn't 16:9, you have two honest options — stretching isn't one of them, which is why this tool never distorts. Crop to fill scales the image until it covers the whole frame and trims the overflow — use the position slider to keep faces and text in view. Letterbox keeps the entire image and pads it with black bars, which is exactly what YouTube would do anyway — only useful when nothing can be trimmed. In a feed where every thumbnail competes at the same size, filled frames win.
What makes a good YouTube thumbnail?
A correctly sized thumbnail is table stakes; what's on it decides the click. Preview how yours reads next to real search results in the Thumbnail Previewer, pull a competitor's art for reference with the Thumbnail Downloader, and run the video's metadata through the Video SEO Checker before you publish.
Frequently asked questions
What size should a YouTube thumbnail be?+
1280 × 720 pixels at a 16:9 aspect ratio, under 2MB, as a JPG, PNG or GIF. YouTube's stated minimum width is 640 pixels, but 1280 × 720 is the size it recommends and the one this tool exports.
Why does YouTube say my thumbnail is too big?+
You've hit the 2MB file-size limit — the most common rejection, usually from exporting a PNG with a photographic background. Re-export as a JPG: this tool's JPG option automatically steps the quality down until the file fits under 2MB.
What happens if my image isn't 16:9?+
YouTube doesn't crop it to fit — it letterboxes it with black bars, so your artwork renders smaller than every other thumbnail in the row. Cropping to fill the 16:9 frame almost always looks better; this tool lets you slide the crop so the important part stays in view.
Can I upload a 1920×1080 thumbnail instead?+
Yes — any 16:9 image at or above the minimum width is accepted. There's no visual benefit though: YouTube resizes everything down to its own serving sizes, and a bigger file is more likely to trip the 2MB limit. 1280 × 720 is the sweet spot.
Does my image get uploaded anywhere?+
No. The resizing, cropping and compression all happen in your browser using the canvas API — the image never leaves your device, and there's nothing for us to store.
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