Image dimensions
Choose an image file — width × height pixels are read entirely on your device.
Check size before upload or resize
Image dimensions matter when you are preparing product photos, website banners, or print drafts. Reading the width and height first helps you decide whether the image is already large enough or whether it needs resizing, cropping, or upscaling.
Useful for layout and marketplace rules
Many platforms have minimum size recommendations or preferred aspect ratios, so a quick dimensions check can save repeated uploads. It is also handy when you are matching a design mockup and need to confirm the exact pixel size of a source file.
Before you resize or upload
Check pixel width and height before batch processing listing photos — marketplaces reject undersized main images.
Formats
Ordinary JPEG PNG WebP behave best — exotic RAW may fail.
Layout and performance
Oversized hero images slow page loads; undersized assets look blurry on retina screens. Reading native pixel dimensions first helps you choose export sizes that balance quality and weight.
Responsive breakpoints
Compare intrinsic pixels against CSS layout widths to decide whether you need 1x and 2x asset variants for retina phone screens.
Quick start
- Choose a local image file — Select JPEG, PNG, WebP, or another supported raster from your device.
- Read width and height — Pixel dimensions appear without uploading the file to a server.
- Use for layout planning — Pair with the aspect ratio or batch resize tools for export workflows.