Free Tool · No signup · No upload

Image Resizer

Resize any image to exact dimensions, entirely in your browser. Pick a common preset or set a custom size, aspect ratio stays locked by default so nothing gets stretched.

Why use our Image Resizer

Oversized images slow every page

A 4000px camera photo displayed at 800px wide still costs the full download weight, resizing to the actual display size is one of the biggest, easiest speed wins.

Correct dimensions for social sharing

Open Graph images need to be an exact size to render correctly on Facebook, LinkedIn, and Slack, the wrong dimensions get cropped or scaled awkwardly.

100% local, nothing uploaded

Resizing happens in your browser's own canvas engine, your image is never sent to any server.

Aspect ratio locked by default

Change width and height stays proportional automatically, unlock it only if you specifically need to change the aspect ratio.

Drop an image here, or click to browse

JPEG, PNG, WebP, or AVIF — processed entirely in your browser

Real Image Resizer example: before vs. after

Resizing a 4000px camera photo down to the 1200px it's actually displayed at on the page.

Before · Original

4000×3000

2.1 MB

Full camera resolution, way larger than any page layout actually displays it at.

After · Resized to display size

1200×900

310 KB

Same image, correctly sized, loads faster with no visible quality loss at display size.

Frequently Asked Questions

Is my image uploaded to a server?

No. Resizing happens entirely in your browser using the native canvas API. Your image never leaves your device.

Can I resize up (make an image larger)?

This tool won't upscale past the original size, enlarging a small image just makes it blurry since there's no extra detail to add. For anything larger than the original, you need a new, higher-resolution source image.

What size should my Open Graph image be?

1200×630px is the safe standard most platforms (Facebook, LinkedIn, Slack) render correctly, that's the first preset above.

Why lock the aspect ratio?

Changing width and height independently stretches or squashes the image. Locking the ratio keeps it proportional, unlock it only if you deliberately want a different shape.

Find every oversized image on your site

SEOMentor scans your whole site and flags images that are larger than they need to be for how they're actually displayed.

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