Image Resizer

A product photo that's 4000 pixels wide loads slowly on a website built for 800-pixel content columns, and a profile picture upload that expects a square 200x200 image will look distorted if you upload something oddly shaped without resizing first. This tool changes an image's pixel dimensions directly in your browser, with no upload to any server.

How the aspect ratio lock works

With "Lock aspect ratio" checked, changing the width automatically recalculates a proportional height (and vice versa), so your image doesn't come out stretched or squashed. Uncheck it if you deliberately want to force a specific width and height regardless of the original proportions — useful when a platform requires an exact size like 1200x630 for a social share image.

Common situations this solves

Shrinking a phone camera photo (often 3000+ pixels wide) down to a reasonable size before uploading it to a blog post, since oversized images slow down page load and hurt Core Web Vitals scores. Resizing a logo to fit an exact pixel requirement for a marketplace listing or app store submission. Preparing a batch of product images to a consistent size before adding them to an online store.

Frequently Asked Questions

Does resizing reduce file size too? Usually yes, since fewer pixels generally means a smaller file, but for precise file-size control (not just dimensions), use the Image Compressor tool instead.

Is my image uploaded to a server? No — resizing happens entirely in your browser using the HTML5 Canvas API; the image never leaves your device.

What file format does the resized image download as? It downloads as a PNG, which preserves quality and transparency; if you need a smaller JPG file, run the result through the Image Compressor tool afterward.