File Size
The amount of storage space an image file occupies, measured in bytes (B), kilobytes (KB), or megabytes (MB).
File size indicates the total data volume of an image and directly affects storage consumption, transfer time, and display speed. Uncompressed size is calculated as width × height × bytes per pixel: a 1920×1080 image at 24-bit color occupies approximately 6.2 MB. Actual file sizes are substantially reduced through compression.
Images often account for over 50% of total web page weight, making file size optimization critical for load performance. Google recommends LCP (Largest Contentful Paint) under 2.5 seconds, and reducing hero image size is one of the most effective improvements.
The image compression tool can reduce file sizes by 50-80% while maintaining visual quality. Format choice also matters: at equivalent quality, WebP produces files 25-35% smaller than JPEG.