Image dimensions are the width and height measured in pixels, for example 1920 × 1080. They are different from file size, which is measured in KB or MB.
Use the Dimension Checker
Select an image in TheTecTricks Image Dimension Checker. Your browser reads the image locally and displays its pixel dimensions, aspect ratio, file type and size.
Why dimensions matter
Websites, profile pictures, banners and application forms often require a particular width-to-height ratio. Checking the dimensions before uploading can prevent unwanted cropping or rejection.