Image Tools

YouTube Thumbnail Resize

Crops and resizes one image to a 1280×720 (16:9) YouTube thumbnail. A live preview shows what is kept and a slider moves the crop. Runs in your browser.

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Output is exactly 1280×720 px. The picture is scaled until it fills that frame and the overflow is cropped. You choose which part is kept.

How to Use

  1. 1Drop in one image, or choose it from your device.
  2. 2Check the preview and drag the slider to choose which part of the picture stays in the frame.
  3. 3Pick JPEG or PNG under File type, or leave it on the original.
  4. 4Click “Resize for YouTube Thumbnail” and download the 1280×720 file.

About this tool

Updated

What YouTube asks for

YouTube recommends 3840×2160 for video thumbnails, accepts anything at least 640 pixels wide, prefers 16:9, and limits uploads to 2 MB on mobile or 50 MB on desktop.

These come from YouTube’s help page on custom thumbnails. It recommends a resolution of 3840×2160 pixels for videos (2160×3840 for Shorts) with a minimum width of 640 pixels for videos, in an image format such as JPG or PNG. It asks for an aspect ratio of 16:9 for videos and 9:16 for Shorts. The size limits depend on the device: 2 MB for video thumbnails from mobile and 50 MB from desktop. Source: YouTube Help, add custom thumbnails. Checked against the platform’s own help page on 6 October 2026.

Where 1280×720 fits

1280×720 is 16:9 and above the 640-pixel minimum, so YouTube accepts it. It is smaller than the 3840×2160 now recommended.

It is a sensible output when your source is modest or when you upload from a phone and need to stay under 2 MB. If your original is large and you are on a computer, a bigger file is closer to what YouTube recommends; Image Resizer can set an exact 3840×2160 size. This page makes the 1280×720 version and does not claim it is the largest YouTube allows.

Choosing what the crop keeps

A photo that is not 16:9 loses part of its height or width. The slider decides which part, and the page shows how much is kept.

A 4:3 photo keeps 75% of its height in a 16:9 frame, a 3:2 photo about 84%, and a vertical 9:16 phone photo only about 32%. Those figures are arithmetic from the shapes. Text and faces should sit inside the part you keep, so move the slider until the preview shows them whole. A picture already 16:9 is not cropped at all and the page says so.

File size and type

JPEG gives much smaller files than PNG for photographs, which matters against YouTube’s 2 MB mobile limit.

A PNG of a detailed photograph is usually several times larger than the same picture as a JPEG, so choose JPEG unless the thumbnail is mostly flat colour and sharp text. Check the size of the downloaded file against the limit for the device you upload from. If it is over, Image Compressor or Compress Image to KB will bring it down.

Features

  • Exactly 1280×720 pixels (16:9)
  • Live preview that matches the exported crop
  • Slider to choose which part is kept
  • JPEG or PNG output, or the original type
  • Runs in your browser; the image is not uploaded

FAQ

Is 1280×720 the size YouTube recommends?

Not on YouTube’s current help page, which recommends 3840×2160 for video thumbnails and accepts anything at least 640 pixels wide. 1280×720 is 16:9 and well above that minimum, so it is accepted; it is simply smaller than the current recommendation.

What is the file-size limit?

YouTube says the limit depends on the device you upload from: 2 MB for video thumbnails on mobile and 50 MB on desktop. JPG and PNG are the formats it names.

Does this make Shorts thumbnails?

No. YouTube recommends 9:16 for Shorts, at 2160×3840. This page makes a 16:9 frame only.

Why did my vertical video’s thumbnail change shape?

YouTube’s help page says a vertical video given a 16:9 custom thumbnail is replaced by an automatically generated 4:5 thumbnail on the home, explore and subscription pages. The custom one still appears on the watch feed, watch history and non-mobile platforms.

Is my image uploaded?

No. The resize happens in your browser.

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