Image Dimension Checker

What Does This Tool Show?

The image's actual pixel width and height, its simplified aspect ratio, file size, and MIME type - all read directly from the file using your browser's own image-decoding capability.

Why Use This Tool?

Useful for quickly checking whether an image meets a platform's dimension requirements (like a specific social media image size) before uploading it anywhere.

How to Use It

1. Upload or drag an image file.
2. Review its width, height, aspect ratio, file size, and type - shown immediately.

Important Notes

Your image is read entirely in your browser using the File and Image APIs - it is never uploaded to any server.

Recommended Sizes for Common Uses

Platforms change their recommendations from time to time, so check the platform's help pages for anything critical.

Pixels vs Display Size

An image shown 600 pixels wide on a phone with a 3× screen needs about 1800 pixels of real width to look sharp. That is why websites serve several sizes with srcset - large screens get large files, phones get smaller ones.

Also Check the File Size

A 4000-pixel photo straight from a camera can be 5 MB or more. For the web, resize to the largest size it is displayed at and compress it - often under 200 KB for a large hero image.

Work out proportions with the Image Aspect Ratio Calculator, see full details with the Image Metadata Viewer, and shrink files with the WebP Converter.