How Material Design Icons and MDI Light Differ

Updated

Material Design Icons (MDI) and MDI Light are two separate icon libraries from Pictogrammers. MDI is the original, largest library, following Google's Material Design guidelines for system icons and offering over 7,200 unique icons. MDI Light applies a lighter visual treatment to those same Material Design guidelines, producing icons that are slimmer, more modern, and cleaner. Choose MDI when you want the broadest coverage and a standard Material look; choose MDI Light when you want a thinner, lighter visual weight and can accept a smaller, more stylistically specific set.

The core difference: visual weight

Both libraries share the same design foundation — Google's Material Design guidelines for system icons. The difference is how heavily the icons are drawn.

Dimension Material Design Icons (MDI) MDI Light
Design basis Google Material Design guidelines for system icons A lighter interpretation of the same guidelines
Visual weight Standard, solid strokes Slimmer, thinner strokes
Style character The original Material look Modern, crisp, clean
Library size Over 7,200 unique icons — the largest Pictogrammers library Positioned as a lighter spin on MDI; no size figure given on the page
Best for Projects that need maximum icon coverage and a conventional Material appearance Projects that want a lighter, more refined visual tone

How to choose

The decision comes down to two questions: how much visual weight your interface can carry, and how many icons you actually need.

Choose MDI if:

  • You need the widest possible icon coverage — with over 7,200 icons, it is the largest library Pictogrammers offers.
  • You want icons that read as standard Material Design, matching Google's system icon conventions.
  • Your UI already uses heavier typography or dense components where thin strokes would disappear.

Choose MDI Light if:

  • You want a lighter, more modern, and cleaner look than standard Material icons.
  • Your interface uses light typography, generous whitespace, or minimal chrome where heavy icons would feel out of place.
  • You can work within a more stylistically specific set rather than the full MDI catalog.

A practical note on consistency

Because MDI Light is a lighter spin on the same Material Design guidelines, the two libraries are visually related but not identical in weight. Mixing them in one interface tends to look inconsistent — a solid MDI icon next to a thin MDI Light icon reads as a mistake rather than a deliberate contrast. Pick one library per project and apply it throughout.

Where to browse both

Pictogrammers presents both libraries on its site under Featured Libraries, each with its own "Browse Library" entry point. Browsing the actual icon grids is the fastest way to judge which weight suits your project — the difference is easier to see than to describe.

Getting involved

Pictogrammers is an open-source, volunteer collaboration. If neither library has the icon you need, the project invites contributions: you can tackle issues and icon requests on a library, write or update documentation, or build an integration that doesn't yet exist. Questions go to the team via Mastodon or a GitHub issue.