Image Resizer is a free, browser-based tool from XO3D Labs. Resize and scale images to exact pixel dimensions with an optional aspect-ratio lock, instant canvas preview and no upload. It is built for 3D artists, CGI generalists and technical artists, runs entirely in your browser with no signup or install, and is one of 70 free tools in the Labs suite.
What it does
Image Resizer scales an image to exact pixel dimensions, either to a ready-made social or web preset or to your own custom size. It processes the image locally in your browser on the canvas, so files are not uploaded and never leave your device. It is free to use with no signup, install or limit on the number of downloads.
How to use it
Load an image by dragging it in or clicking the drop zone. Pick a platform tab (Instagram, Facebook, X / Twitter, YouTube, LinkedIn, Pinterest, or Web / Email) to see a grid of correctly sized presets, then download any single size or use Download All Sizes to export the whole set at once. The Custom tab lets you enter any width and height, with an optional aspect-ratio lock. Choose the output format (PNG, JPG or WebP) and a quality level in the left panel.
Scale modes and presets
Three scale modes control how your image fits each target box: Fill (cover) crops to fill the frame, Fit (contain) letterboxes the whole image inside it, and Stretch forces the exact dimensions. The platform presets cover common placements such as square and portrait posts, stories and reels, profile and cover images, video thumbnails and standard web and email sizes, so you do not have to look up the current pixel dimensions yourself.
Frequently asked questions
What does Image Resizer do?
Resize and scale images to exact pixel dimensions with an optional aspect-ratio lock, instant canvas preview and no upload.
Are my images uploaded to a server?
No. Images are processed locally in your browser, so nothing is uploaded and your files never leave your device.
Is Image Resizer free to use?
Yes. Image Resizer is completely free, with no account, login, trial or paywall. It is one of 70 free tools published by XO3D Labs.
Do I need to install anything or sign up?
No. The tool runs entirely in your web browser on desktop and mobile - there is nothing to download, install or sign up for.
Who created this tool?
XO3D is a UK-based product CGI studio headquartered in Stevenage, working with brands across the UK and internationally. XO3D Labs is its free tool suite for the CGI and product-marketing community.