Image Resizer

What is Image Resizer?

Upload an image and resize it to specific pixel dimensions by typing a new width or height, with an optional locked aspect ratio so the other dimension updates automatically, then download the result. All processing happens locally with the Canvas API. You can upload any common image format your browser can decode (PNG, JPG, WEBP, and more), and the resized result downloads as a PNG. This is handy for quickly shrinking a screenshot before attaching it somewhere with a size limit, or fitting an image to specific dimensions for a layout, without opening an image editor.

How to Use the Image Resizer

1. 1

   Upload the Image: Choose a photo or screenshot from your device.

2. 2

   Set the Dimensions: Type a new width or height; lock the aspect ratio if needed.

3. 3

   Download the Result: Save the resized image as a PNG.

How This Tool Works

The resize happens entirely on the Canvas API, built into every modern browser. Your image is drawn onto a canvas at the new dimensions and read back out as a PNG. Nothing is uploaded to a server at any point, which means it works offline once the page has loaded, and there's no upload wait, no file-size limit imposed by a server, and no privacy concern about where the image goes, since it never leaves your device.

Common Use Cases

Shrinking a screenshot down before attaching it somewhere with a strict file-size or dimension limit (a support ticket, a form upload, a Slack message). Resizing a photo to match an exact pixel requirement, like a profile picture spec, a marketplace listing's required dimensions, or a website's image guidelines, without installing or opening a full image editor for what's usually a one-off task.