Collection 01
Images and video
Understand pixels, proportions, resolution, and print size.
Preview build
A field guide to everyday digital things
What do you want to understand?
Clear explanations and useful tools for everyday digital questions.
Two connected collections
Learn one useful piece at a time
Collection 02
Web basics
Understand web addresses, networks, online services, and security basics.
Start here
Start with a clear question
01What is aspect ratio?Aspect ratio describes the proportional relationship between an image's width and height.02What is image resolution?Image resolution usually describes an image's pixel dimensions and, for print, how pixels map to physical size.03What is a URL?A URL is an address that identifies a resource and describes how to access it.04What is a pixel?A pixel is one sample in the grid used to store and display a digital image.05What is PPI?PPI means pixels per inch and relates an image's pixel grid to a physical size.06What is a domain name?A domain name is a human-readable name used to reach an internet resource.
Work it out
Three tools, no account needed
Aspect ratio calculatorFind a missing dimension or reduce a width and height to a ratio. Planned for the tool phase.Planned
Image print size calculatorConvert pixel dimensions and PPI into a physical print size. Planned for the tool phase.Planned
URL explorerBreak a web address into browser-normalized components without fetching it. Planned for the tool phase.Planned