# Image Thumbnail Generator

Generate a thumbnail of an exact width and height from any image. The tool scales the picture to cover the frame and crops the overflow, using smart cropping that keeps the most interesting or most detailed area in view, or a plain centered crop. Choose JPEG, PNG or WebP output. It is made for blog previews, product listings, video covers, galleries and app assets.

## Frequently asked questions

### How does the thumbnail generator work?

It scales your image until it fully covers the requested width and height, then crops whatever extends beyond the frame. The thumbnail always has exactly the size you entered and is never stretched or distorted.

### What sizes can I create?

Width and height can each be any whole number from 16 to 1000 pixels, with 200 by 200 as the default. Use equal values for a square thumbnail or different values for a landscape or portrait card.

### What is smart cropping?

Smart (most interesting area) looks for faces, skin tones and strong color and keeps them in the frame. Smart (most detail) keeps the region with the most edges and texture. Center simply keeps the middle of the image.

### Which output format should I choose?

JPEG gives small files for photos and is the default. WebP is usually smaller still and supports transparency. PNG is lossless and keeps transparency, which suits logos and graphics.

### What happens to transparency in JPEG thumbnails?

JPEG cannot store transparency, so transparent areas are filled with white before encoding. Choose PNG or WebP to keep a transparent background.

### What quality does the tool use?

JPEG and WebP thumbnails are encoded at quality 85, a good balance of sharpness and file size for small images. PNG thumbnails are lossless.

### Can I make a thumbnail larger than my image?

Yes, a small image is enlarged to cover the frame, but enlargement cannot add detail and may look soft. For the sharpest result, start from an image at least as large as the thumbnail.

### Which file formats can I upload?

JPEG, PNG, GIF, WebP, TIFF and AVIF images up to 5 MB are supported. Animated files use their first frame.

### What sizes are common for thumbnails?

YouTube recommends 1280 by 720, which you can scale down from a 16:9 thumbnail. Blog cards often use 400 by 225 or 600 by 400, product grids use squares such as 300 by 300, and avatars 128 or 256 pixels.

### How is this different from resizing?

The Image Resize tool can keep the whole image and leave it smaller than the box. The thumbnail generator always fills the exact size by cropping, and it chooses the crop with smart focus so the subject stays visible.

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