Does resizing reduce file size too?

Usually, yes — fewer pixels generally means a smaller file, though the exact size also depends on the image content and output format.

What happens if I turn off "Lock aspect ratio"?

You can set width and height independently, which will stretch or squash the image if the new proportions don't match the original.

Can I enlarge an image beyond its original size?

Yes, though enlarging beyond the original resolution can make the image look soft or blurry, since no new detail is added — only existing pixels are scaled up.

What format is the resized image saved in?

The same format as your original upload (JPEG, PNG, or WebP), preserving characteristics like transparency for PNG.

Image Resizer

Resize images to exact dimensions in seconds.

Image & DesignLast updated August 2026

Resize an image to exact pixel dimensions

Drag and drop an image, or click to browse

JPG, PNG, WebP, or GIF

How to use it

1Drag and drop an image, or click to browse.
2Use a percentage preset, or type an exact width and height.
3Toggle "Lock aspect ratio" on or off as needed, then download.

Supported formats & limits

Supports common formats like JPG, PNG, and WebP. Processing happens in your browser.

Example

Upload a 4000×3000px photo, use the 25% preset to get 1000×750px instantly, or type an exact width — with “Lock aspect ratio” on, the height updates to match automatically so nothing looks stretched.

How it works

Your image is redrawn onto a canvas at the exact pixel dimensions you set, using the browser's highest-quality resampling, then re-encoded in its original format. Locking the aspect ratio keeps width and height proportional to the original so the image doesn't distort. If you set dimensions larger than the original, a warning appears since upscaling stretches existing pixels rather than adding detail.

Frequently asked questions

Related guides

Wikipedia

Image scaling

How pixels are added or removed when an image changes size.